Question
A man travels x km downstream and the same distance upstream in 11 hours. He can row 3x km downstream in 6 hours. Find the time required to row x km upstream.
Solution
Let the downstream speed of the boat be ‘a’ km/hr According to the question, (3x/a) = 6 Or, (x/a) = (6/3) Or, (x/a) = 2 = time taken to travel ‘x’ km downstream Let the upstream speed of the boat be ‘b’ km/hr Also, (x/a) + (x/b) = 11 Or, 2 + (x/b) = 11 Or, (x/b) = 9 hours
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