A man can row a boat with a speed of 6\(\frac{3}{5}\) km. in still water. He finds out that he takes twice of the time in going against the stream than going with the stream. Accordingly, what is the speed of stream?
Answer & explanation
Correct answer: option 4
∴ If distance is same then, ratio of speed = \(\frac{1}{ratio of time}\)
ATQ, Downstream (D.S) : Upstream (U.S)
Time → 1 : 2
Speed → 2 : 1
Boat Speed : Stream Speed
\(\frac{D.S + U.S}{2}\) : \(\frac{D.S - U.S}{2}\)
\(\frac{2 + 1}{2}\) : \(\frac{2 - 1}{2}\)
3 : 1
x\(\frac{11}{5}\) ↓ ↓ x\(\frac{11}{5}\)
(given) \(\frac{33}{5}\) km/hr 2\(\frac{1}{5}\)