A boatman can row at 6 kmph in standing water and the speed of the current is 3 kmph. If it takes him 1 hour to row to a place and come back then find how far is that place.

0.4 km

1 km

2 km

3/4 km

4/9 km

Let the distance is x km Rate downstream = 6 + 3 = 9 kmph Rate upstream = 6 - 3 = 3 kmph then x/9 + x/3 = 1 [because distance/speed = time] => x + 3x = 9 => 4x = 9 => x = 4/9

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