A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9km/hr and the speed of the current is 3km/hr, the distance A and B is:_______?
Q1. A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9km/hr and the speed of the current is 3km/hr, the distance A and B is:_______?
Answer: 12 km
Explanation: Upstream speed = 9−3 = 6 km/h; downstream speed = 12 km/h. Total time: d/12 + d/6 = 3 → d = 12 km.