Question
A man can row boat at 9 kmph in still water. If the
velocity of the current is 6 kmph and he takes 2 hour to row to a place and come back, how far is the place?Solution
Let the distance be D km. Speed of man in still water (x) = 9 kmph Speed of current (y) = 6 kmph Speed of downstream (x + y) = 9 + 6 = 15 kmph Speed of upstream (x – y) = 9 - 6 = 3 kmph According to the question, => (D/15) + (D/3) = 2 => D = 30/6 = 5 kmÂ
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