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?
Answer with explanationAnswer: Option B
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
Discuss about the question