Question

John covers a distance by driving a car at 60 kmph and he returns back to the starting point on the scooter at 40 kmph. Find the average speed for the whole journey. A. 48 kmph B. 50 kmph C. 51 kmph D. 54 kmph

Answer 1

Average speed = ( 60 + 40 )/2 = 100/2 = 50Kmph . So, option (B) is the correct answer.

Answer 2

let distance be x
total distance is 2x
time for going=x/60
time taken for returning=x/40
total time=(x/60)+(x/40)
=5x/120
avg speed=total dis./ total time
=2x/(5x/120)
=48