A man can row at 5 kmph in still water. If the velocity of current is 1 kmph and it takes him 1 hour to row to a place and come back, how far is the place?

(a) 2.4 km
(b) 2.5 km
(c) 3 km
(d) 3.6 km
Correct option: (a) 2.4 km
Given,
Downstream speed = (5 + 1) km/hr = 6 km/hr
Upstream speed = (5 – 1) km/hr = 4 km/hr
Let x be the required distance.
So, (x/6) + (x/4) = 1
(2x + 3x)/12 = 1
5x = 12
x = 12/5
x = 2.4 km

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