Question

a motorcyclist drives from the place A to B with uniform speed of 30 km per hour and returns from place B to A with a uniform speed of 20 km per hour find its average speed

Answer 1

Hey

(A)●------------------------------------●(B)

Suppose that the body covered the distance from A to B
Let the distance between those two points be d
Speed1 = 30km/h
Time 1 = distance / speed
= d/30 h

Speed while returning = 20km
Time 2 = d/20 h

Average speed = total distance covered / total time taken

=( d+d) ÷ (d/20) +(d/30)
= 2d ÷ (3d+2d) / 60
= (12)(2)
= 24
So, the average speed was 24 km/h.

Hope it helps to you.