A man can row 36 km/hr in still water. It takes him thrice as long to row up as to row down the river. Find the rate of stream.

A man can row 36 km/hr in still water. It takes him thrice as long to row up as to row down the river. Find the rate of stream.
1). 18 km/hr
2). 5 km/hr
3). 8 km/hr
4). 10 km/hr

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