A man covered a certain distance at an average speed of 60 km/hr and comes back at the speed of 40 km/hr. Find the average speed (in km/hr) of the man during the whole journey?
Answer & explanation
Correct answer: option 2
Let speed of man while going = A
speed of man while coming back = B
Average speed = \(\frac{2 ×A× B }{A + B}\)
= \(\frac{2 ×60 × 40 }{60 + 40}\) = \(\frac{2 × 2400 }{100}\) = 48 km/hr