A man can row 15 km/hr in still water. If in a river running at 3 km/hr, it takes him 1 hour to row to a place and back, how far off is the place ?

6 km

6.5 km

7.2 km

8.4 km

a = (15 + 3) = 18 km/hr b = (15 -3) = 12 km/hr. Let the required distance be x km. then, => x/18 + x/12 = 1 => 2x+3x = 36 => x =36/5 => x = 7.2 km.

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