Question

A man covers a certain distance at 75 km/hr and returns back to the starting point at 50 km/hr. Find his average speed during the whole journey.

Answer 1

Answer:

the answer is 60km/hr

Explanation:

when u=50km/hr,   x=50t1

when u=75km/hr,    x=75t2

average speed= total distance covered/total time taken

                          =2x/(x/50+x/75)

                         =2x/(125x/75×50)

                        =60km/hr