Question

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​

Answer 1

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