Question
A rower covers x km downstream and the same distance
upstream in 13 hours. He can row 2x km downstream in 4 hours. What is the time taken to row x km upstream?Solution
Let the downstream speed of the boat be ‘a’ km/hr According to the question, (2x/a) = 4 Or, (x/a) = (4/2) 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) = 13 Or, 2 + (x/b) = 13 Or, (x/b) = 11 hours
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