We will discuss here how to find the time when speed and distance are given.

When distance and speed are given the time taken is calculated by using the formula:

**Time = Distance/Speed**

Solved examples to calculate time when speed and distance are given:

**1.** How much time will be taken to cover a distance of 300 km at a speed of 60 km per hour?

Solution:

Time taken to cover 60 km = 1 hour.

Time taken to cover 1 km = 1/60 hour.

Time taken to cover 300 km = 1/60 × 300 hour.

= 5 hours.

Therefore, time taken to cover 300 km is 5 hours.

**2.** A man runs at the speed of 15 km per hour. How much time
will he take to cover 750 metres?

Speed = 15 km per hour

Distance = 750 metres = 750/1000 km = ¾ km

Time = distance/speed = (3/4 ÷ 15) km

= (3/4 × 1/15) hr

= 1/20 hr

= 1/20 × 60 min = 3 minutes.

**3.** How much time will be taken to cover a distance of 450 km at a speed of 50 km per hour?

Solution:

Time taken to cover 50 km = 1 hour.

Time taken to cover 1 km = 1/50 hour.

Time taken to cover 450 km = 1/50 × 450 hour.

= 5 hours.

Therefore, time taken to cover 450 km is 9 hours.

4. A motorised rickshaw covers a distance of 150 km at a speed of 30 km/hour. Find the time taken to cover this distance.

Time = distance/speed

Time = 150 km/(30 km/hour)

= (150 km/30 km) × hour

= 5 hours.

**5.** A cyclist covers a distance of 12 km at a speed of 8 km
per hour. Calculate the time taken to cover this distance.

Speed = 8 km/hour

Distance covered = 12 km

Time taken = total distance covered/speed

= 15/8 hour

= 3/2 hours

= 1 ½ hours.

**6.** How much time will be taken to cover 20 m at a speed of 20 cm per second?

Solution:

Time taken to cover 20 cm = 1 sec.

Time taken to cover 1 cm = 1/20 sec.

1 metre = 100 cm,

20 metre = 20 × 100 cm.

= 2000 cm.

Time taken to cover 20 m = 1/20 × 2000

= 200 sec.

Therefore, time taken to cover 20 m is 200 sec.

**Relation of Speed Distance and Time**

**Express Speed in Different Units**

**To find Speed when Distance and Time are given. **

**To find the Distance when Speed and Time are given.**

**To find Time when Distance and Speed are given.**

**Worksheet on Expressing Speed in Different Units**

**Worksheet on Speed, Distance and Time.**

**5th Grade Numbers Page**

**5th Grade Math Problems**

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