A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is:

Answer: Option B

Let man's rate upstream be x kmph
Then, his rate downstream = 2x kmph
∴ (speed in still water) : (Speed of stream)
$$\begin{array}{rl}& =\frac{2x+x}{2}:\frac{2x-x}{2}\\ & =\frac{3x}{2}:\frac{x}{2}\\ & =3:1\end{array}$$