Practicing Success
A man covered a certain distance at an average speed of 60 km/hr and comes back at the speed of 30 km/hr. Find the average speed (in km/hr) of the man during the whole journey? |
62 km/hr 55 km/hr 40 km/hr 50 km/hr |
40 km/hr |
Let speed of man while going = A speed of man while coming back = B Average speed = \(\frac{2 ×A × B }{A + B}\) = \(\frac{2 ×60 × 30 }{60 + 30}\) = \(\frac{2 × 1800 }{90}\) = 40 km/hr |