Question

A boy goes from his house to school by bus
at a speed of 20 km h-1 and returns back
through the same route at a speed of
30 km h-!. The average speed of his
journey is :​

Answer 1

Explanation:

if the route consists of 2 or more equal parts then, n/V.avg.=1/v1+1/v2 _ _ _and so on.....

there are two equal parts of the route