A boatman takes twice as long to go a distance upstream as to travel the same distance downstream . What is the ratio of the speed of the boatman (in still water) and the current?
A. 2 : 3
B. 3 : 1
C. 1 : 3
D. 4 : 3
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সঠিক উত্তরঃ
B.
3 : 1
Explanation:
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