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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:

2 : 1
3 : 1
3 : 2
4 : 3

Correct Answer: 3 : 1

Explanation:

Let man's rate upstream be x kmph.

Then, his rate downstream = 2x kmph.

∴ (Speed in still water) : (Speed of stream) =	❨	2x + x	❩	:	❨	2x - x	❩
		2				2

=	3x	:	x
	2		2

= 3 : 1.

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