A boat travels upstream from B to A and downstream from A to B in 4 hours. If the speed of the boat in still water is 8 km/hr and the speed of the current is 4 km/hr the distance between A and B is _____ km.

A boat travels upstream from B to A and downstream from A to B in 4 hours. If the speed of the boat in still water is 8 km/hr and the speed of the current is 4 km/hr the distance between A and B is _____ km.
1). 12
2). 16
3). 24
4). 18

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