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:
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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