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A man can row at a speed of 4(1)/(2...

A man can row at a speed of `4(1)/(2)` km /hr in still water . If he takes 2 times as long to row a distance upstream as to row the same distance downstream . Then , the speed of stream (in km/hr) is

A

1

B

1.5

C

2

D

2.5

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