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

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Question: 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:

Options are:

A.     2 : 1
B.     3 : 1
C.     3 : 2
D.     4 : 3

Correct answer is:

B.     3 : 1