# Time Duration

We will learn how to calculate the time duration in minutes and in hours.

We can calculate the duration of an activity if we know the starting and finishing time. For example, if the morning assembly in a school begins at 8:00 a.m. and finishes at 8:25 a.m. the duration of assembly is the difference of finishing time and starting time.

0825 - 800 = 25 minutes.

So, if we know the starting time and the duration of an activity, we can calculate finishing time of the activity.

Time Duration (in minutes)

Ron and Clara play badminton every evening. Yesterday, their game started at 5 : 15 p.m. and finished at 5 : 50 p.m. How long did their game last?

50 minutes — 15 minutes---- 35 minutes.

Rita left for Naira’s house at 7 : 30 p.m. She reached Naira’s house at 8:10 p.m. How long did it take her on the way?

7 : 30 p.m.     → 8 : 00 p.m.     → 8 : 10 p.m.

It took Rita 40 minutes to reach Naira’s house.

Time Duration (in hours and minutes)

Uma's flight took off from New Delhi at 11 : 15 in the morning (11 : 15 a.m.). When it arrived in Mumbai, her watch read 1 : 32 in the afternoon (1 : 32 p.m.). How long was the flight?

Look at the clocks.

Count the number of hours from 11 : 15 to 1 : 15. It is 2 hours.

Count by 5s and 1s to count the minutes from 1 : 15 to 1 : 32.

It is 17 minutes.

The flight was 2 hours and 17 minutes long.

Andy left his home for school at 6 : 30 a.m. He reached school after 40 minutes. At what time did he reach school?

30 minutes   +   10 minutes

Andy reached school at 7 : 10 a.m.

Duration of Time:

Duration of an activity is the difference between the starting time and finishing time. When the starting and finishing time is given, we can easily find the duration of any activity.

For examples, if Terry boarded her school bus at 7 o’clock and she reached school at 8 o’clock, the duration of her travel is 1 hour.

Solved Example on Duration of Time:

Nancy started walking in a park at 6:00 a.m. She walked for 1 hour. At what time did she stop walking?

Solution:

Starting time = 6:00

Duration of walking = 1 hour

The time after 1 hour = 6 + 1 = 7

Nancy stopped walking at 7 o’clock.

Questions and Answers on Duration of Time:

1. How many minutes have passed from the time on:

(i) Clock A and Clock B __________

(ii) Clock C and Clock D __________

1. (i) 50 minutes

(ii) 15 minutes

2. How many hours and minutes are there between:

(i) 7:20 a.m. and 11:10 a.m.

(ii) 6:15 a.m. and 9:40 a.m.

(iii) 9:00 a.m. and 7:30 p.m.

(iv) 5:20 p.m. and 7:40 p.m.

2. (i) 3 hours 50 minutes

(ii) 3 hours 25 minutes

(iii) 10 hours 30 minutes

(iv) 2 hours 20 minutes

3. What will be the time after 1 hour?

(i) 8:00 → _____

(ii) 9:00 → _____

(iii) 10:00 → _____

(iv) 8:30 → _____

(v) 10:30 → _____

(vi) 5:30 → _____

3. (i) 9:00

(ii) 10:00

(iii) 11:00

(iv) 9:30

(v) 11:30

(vi) 6:30

4. How many hours have passed when the hour hand moved from:

(i) 10 to 12

(ii) 4 to 8

(iii) 9 to 12

(iv) 5 to 9

(v) 8 to 12

(vi) 11 to 12

4. (i) 2 hours

(ii) 4 hours

(iii) 3 hours

(iv) 4 hours

(v) 4 hours

(vi) 1 hour

5. Draw hands to show the time 1 hour after the given time in each set of clocks.

5.

6. What will be the time 6 hours 30 minutes after the following times.

(i) 9:00 a.m.

(ii) 10:45 p.m.

(iii) 6:15 a.m.

(iv) 2:30 p.m.

6. (i) 3:30 p.m.

(ii) 5:15 a.m.

(iii) 12:45 p.m.

(iv) 9:00 p.m.

7. Fill the missing places in the table.

 S.No. Start Time End Time Elapsed Time (i) 10:45 a.m. 1:15 p.m. __________ (ii) 4:30 p.m. 11:15 p.m. __________ (iii) 2:00 p.m. 3:15 a.m. __________ (iv) 9:32 p.m. __________ 2 hours 16 minutes (v) __________ 8:47 a.m. 6 hours 14 minutes

7. (i) 2 hours 30 minutes

(ii) 6 hours 45 minutes

(iii) 13 hours 15 minutes

(iv) 11:48 p.m.

(v) 2:33 a.m.

Worksheet on Word Problems on Time Duration:

8. On May 1, The Sun rose at 5:05 a.m. and set at 7:45 p.m. For how long could the Sun be seen?

9. Sharon is unwell and the doctor advised her to drink Glucose after every 45 minutes. If Sharon drank a glass of Glucose at 7:30 a.m., then at what time will she take the next two glasses of Glucose?

10. The weather report of a city is updated after every 5$$\frac{1}{2}$$ hours. If the report was updated at 8:30 p.m., then when will the next update take place?

11. Rita took 7 hours 10 minutes to travel from state A to State B. If she reached the state B at 12:00 noon, at what time did she leave from the state A.

12. Mike completed his work in 1 hour 35 minutes. He started at 4:45 p.m. At what time did he complete his work?

13. Tine started her homework at 6:30 p.m. and finished at 7:10 p.m. Find the elapsed time.

(i) 1 hour 40 min

(ii) 30 min

(iii) 40 min

(iv) 1 hour 5 min

13. (iii) 40 min

14. Sam started decorating his Christmas Tree at 7:35 p.m.. He completed his work in 1 hour 23 min. At what time did he finish his work?

(i) 9:50 a.m.

(ii) 8:58 p.m.

(iii) 7:40 a.m.

(iv) 8:50 p.m.

14. (ii) 8:58 p.m.

15. In a school, the first period starts at 7:40 a.m. If each period is for 30 minutes, what will be the time at the end of the third period?

(i) 9:30 a.m.

(ii) 10:00 a.m.

(iii) 9:10 a.m.

(iv) 11:00 p.m.

15. (iii) 9:10 a.m.

## You might like these

• ### Measuring the Line Segment | Comparing Line Segments

We will discuss here about measuring the line segment i.e. how to draw and measure a line segment using scale or ruler. We can measure a line segment by two ways. (i) With the help of scale

• ### Using a Ruler | Measure a Length | Length of an Object|Find the Length

We will learn measure a length using a ruler. The ruler given below has 15 cm marked on it. The length of the ruler is 15 cm. To measure a length of a pencil, place at the ‘0’ of the ruler at the one end of the pencil and note the position of the other end.

• ### Addition of Hours, Minutes and Seconds | Addition of Time | Time Calcu

We will discuss here about the addition of hours, minutes and seconds. Let us consider some of the examples on adding time.

• ### Worksheet on Conversion of Time | Convert into Hours and Minutes

We know that hour, minute and second are the units, we use to measure the time. Now we will practice the questions given in the worksheet on conversion of time.

• ### 24 Hour Clock | Air and Railway Travel Timetables | General Time

We normally use 12-hour clock system. The hour hand of the clock goes round the dial twice a day (24 hours). Some departments like railways, Airlines, etc use 24-hour clock system because they do

• ### Units of Time Conversion Chart | Conversion Chart | Us Method | Time

Units of time conversion chart are discussed here in hour, minute, second, day, week, month, and year. We know that there are 12 months in a year. The months of January, March, May, July, August, October and December have 31 days. The months of April, June, September and

• ### Conversion of Minutes into Hours | Convert Minutes to Hours | Time

We will discuss here about the conversion of minutes into hours. We know 60 minutes is equal to 1 hour, which is required to convert the measuring time from minutes to hours.

• ### Conversion of Seconds into Minutes | Seconds to Minutes Conversion

We will discuss here about the conversion of seconds into minutes. We know 1 second is equal to 1/60 minute, which is required to convert the measuring time from seconds to minutes.

• ### Conversion of Hours into Minutes | Hours to Minutes Conversion | Time

We will discuss here about the conversion of hours into minutes. We know 1 hour is equal to 60 minutes which is required to convert the measuring time from hours to minutes.

• ### Units of Time | Second | Minute | Hour | Day | Week | Month | Year

There are different units of time. Second, minute, hour, day, week, month and year are the units of time. These have the following relations between each: 60 seconds = 1 minute

• ### Calendar | Calculating Days | Days in March | Days in April| Leap Year

Calendar helps us to see the dates and along with that the week day of that same dates. Calculating the number of days between two given dates. Riana stayed at her grandmother's house from

• ### Conversion of Minutes into Seconds | Converting Minutes to Seconds

We will discuss here about the conversion of minutes into seconds. We know 1 minute is equal to 60 seconds, which is required to convert the measuring time from minutes to seconds.

• ### Metric Measures | Metric System of Measurement | The Metric System

We will discuss here about the metric measures of length, mass and capacity. As we know, the standard units of length, weight and capacity are metre (m), gram (g) and litre (l)

• ### Smaller Units to Bigger Units | Convert Smaller Metric Unit to Larger

To convert a smaller unit into a bigger unit, we move the decimal point to the left. In other words, we can say that we divide. This is very important for us to learn how to convert smaller

• ### Bigger Units to Smaller Units | Convert Larger Unit into Smaller Unit

To convert a bigger unit a smaller unit, we move the decimal point of the right. In other words, we can say that we multiply. This is very important for us to learn how to convert bigger

Related Concepts