### Math - Class 5 - Time (Speed, Distance and Time) / Calculate Time from Distance and Speed / Word Problems on Time - Key Points/Notes/Worksheets/Explanation/Lesson/Practice Questions

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Ria reaches her school in 10 minutes whereas her friend Dia takes 15 minutes to reach. This mean Ria takes lesser time than her friend Dia to reach school.

##### In the above, the word ‘time’ has been used. Time is measured in seconds, minutes and hours.

**When distance and speed are given in the question we measure time in the following way.****Illustration 1:**How much time will be taken to cover a distance of 100 km at a speed of 10 km per hour?**Solution:**Time taken to cover 10 km = 1hr.Time taken to cover 1 km = 1/10 hrs.

Time taken to cover 100km = 1/10 x 100 = 10 hrs.

**Illustration 2:**A car covers a distance of 150 km at a speed of 50 km/hour. Find the time taken to cover this distance.**Solution:**Time = distance/speedTime = 150 km/(50 km/hour)

= 3 hours.

**Illustration 3:**A motor cyclist covers a distance of 20 km at a speed of 10km per hour. Calculate the time taken to cover this distance.**Solution:**Speed = 10 km/hourDistance covered = 20 km

Time = distance/speed

= 20/10 hour

= 2 hours

**Illustration 4:**A boy runs at a speed of 20 m per minute. How much time will be taken to cover a distance of 1km?**Solution:**20 m is covered in 1 min1 m is covered in 1/20 min

1000 m (i.e. 1km) is covered in 1/20 x 1000 = 50 min

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