A man can row at 10 km/hr in still water. If the velocity of current is 2 km/hr and it takes him 10 hours to row to a place and come back, how far is the place ?

36

24

48

56

Speed downstream = (10 +2) = 12 km/hr Speed upstream = (10 -2) = 8 km/hr. Let the required distance be x km. Then, x/12 + 1/8 = 10 => (2x+3x)/24 = 10 => 5x =10*24 => x = 48 km.

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