A boat takes half time in moving a certain distance downstream than upstream. The ratio of the speed of the boat in still water and that of the stream is?
Answer & explanation
Correct answer: option 2
ATQ, Speed is inversely proportional to Time.
(D.S) Downstream speed = 2x
(U.S) Upstream speed = x
Boat : Stream = \(\frac{D.S + U.S}{2}\) : \(\frac{D.S - U.S}{2}\)
= \(\frac{2x + x}{2}\) : \(\frac{2x - x}{2}\)
= \(\frac{3x}{2}\) : \(\frac{x}{2}\) = 3 : 1