A boy goes to school from home at 10 po
a speed of 10km/hr and return back
at 30 km/hr. find average speed
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Given:
(i) A boy goes to school from home at 10km/hr
(ii) He returns the same distance at 30km/hr
To find:
(i) His average speed
Solution:
Let the distance from his home to school be x km/hr.
Given, the speed is 10km/hr.
So, time taken = Distance/Speed
= x/10 hours
For the return journey,
Time taken = x/30 hours.
Total time taken = (x/10 + x/30) hours
= 4x/30 hours
Total distance = x+x = 2x km
So, average speed = 2x/(4x/30)
= 60x/4x
= 15 km/hr
So,the average speed is 15 km/hr
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