A man can row 6 km/h in still water. If the river is flowing at 2 km/h, how long will it take him to row to a place 16 km upstream and back?
Q1. A man can row 6 km/h in still water. If the river is flowing at 2 km/h, how long will it take him to row to a place 16 km upstream and back?
Answer: 8 hours
Explanation: Speed upstream = 6 - 2 = 4 km/h, downstream = 6 + 2 = 8 km/h. Time taken to row 16 km upstream = 16 / 4 = 4 hours, downstream = 16 / 8 = 2 hours. Total time = 4 + 2 = 6 hours.