A man swims downstream 30 km and upstream 18 km taking 3 hours each time, what is the speed of the man in still water?
Q1. A man swims downstream 30 km and upstream 18 km taking 3 hours each time, what is the speed of the man in still water?
Answer: 8 kmph
Explanation: Downstream speed = 30/3 = 10 km/h; upstream speed = 18/3 = 6 km/h. Speed in still water = (10+6)/2 = 8 km/h.