Time Duration

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

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?

Time Duration

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

How to Calculate the Time Duration

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?

Learn How to Calculate the Time

     30 minutes   +   10 minutes

Andy reached school at 7 : 10 a.m.

Related Concepts

Units for Measuring Length

Measuring Instruments

To Measure the Length of a Line-segment

Perimeter of a Figure

Unit of Mass or Weight

Examples on Unit of Mass or Weight

Units for The Measurement of Capacity

Examples on Measurement of Capacity

Measurement of Time

Read a Watch or a Clock

Antemeridian (a.m.) or Postmeridian (p.m.)

What Time it is?

Time in Hours and Minutes

24 Hour Clock

Units of Time

Examples Units of Time

Time Duration


Reading and Interpreting a Calendar

Calendar Guides us to Know

4th Grade Math Activities

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