A man rows ‘k’ km upstream and back again downstream to the same point in H hours. The speed of rowing in still water is s km/hr and the rate of stream is r km/hr. Then? A. (r + s) = kH / (r -s) B. (s2-r2) =2sk /H C. rs = kH D. None of the above Answer Workspace Report Discuss Answer with explanation Answer: Option B Explanation Time taken to cover total distance = H hrs. Speed of upstream = s – r. Speed of downstream = s + r. ∴ k / (s + r) + k / (s – r) = H ⇒(s2-r2) =2sk /H Workspace
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