Question

A man walk for one minute at a speed of 1 metre per second and then run for one minute at a speed of 3 metre per second along a straight track what is the average speed of the man

Answer 1

total distance covered by the man

1 m/s for one minute = 1×60 = 60m
3 m/s for one minute = 3×60 = 180m

total distance = 60+180 m
= 240m

Average Speed = total distance/total time

Avg speed = 240/120

{ Total time = 2min = 120s}

avg speed = 2 m/s