Question

Mahaboob covers the distance from A to B at the speed of 6 km per hour and it takes him 12 kms to cover the same in the return direction. What is the average speed per hour?

Answer 1

let the distance be x km
from a to b:
speed = 6km/h
distance= x km
time = x/ 6 h
from b to a:
speed = 12km/h
distance= x km
time= x/12 h
average speed = total distance/ total time
ATP,
=2x / (x/6 + x/12)
=2x / (3x/12)
= 2x / (x/4)
= 2x * 4/x
= 8km/h (ans)