A boat travels 10 km upstream and 15 km downstream in 5 hours. If the speed of the current is 2 km/h, what is the speed of the boat in still water?
Q1. A boat travels 10 km upstream and 15 km downstream in 5 hours. If the speed of the current is 2 km/h, what is the speed of the boat in still water?
Answer: 6 km/h
Explanation: Let the speed of the boat be x. Then, 10/(x - 2) + 15/(x + 2) = 5. Solving this equation gives x = 6.