A man can row 5 km/hr in still water, where the river is running at 1 km/hr, it takes him 1 hour to row to a place and back. How far is the place?

A man can row 5 km/hr in still water, where the river is running at 1 km/hr, it takes him 1 hour to row to a place and back. How far is the place?
1). 2.88 km
2). 2.78 km
3). 2.98 km
4). 2.40 km

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