A man takes twice as long to row a distance against the stream as to row the same distance in favor 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

Let man's rate upstream be x kmph. Then, his rate downstream = 2x kmph. => (Speed in still water) : (Speed of stream) = (2x + x)/2 : ( 2x - x)/2 = 3x/2 : x/2 = 3 : 1

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