A man swim at 6 km per hour velocity in still water. He takes 90 minutes to swim from position A to the position B and back in a river when it is flowing at 2 km per hour. The distance between A and B is

A man swim at 6 km per hour velocity in still water. He takes 90 minutes to swim from position A to the position B and back in a river when it is flowing at 2 km per hour. The distance between A and B is
1). 6 km
2). 5 km
3). 4 km
4). 3 km

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