Raju can row at 7 km/hr in still water. If the speed of current is 2 km/hr and it takes him 2 hour to row to a place and come back, how far is the place?

Raju can row at 7 km/hr in still water. If the speed of current is 2 km/hr and it takes him 2 hour to row to a place and come back, how far is the place?
1). 32.1 km
2). 64.2 km
3). 6.42 km
4). 3.21 km

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