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A person can row 7frac(1)(2) km/h in sti...

A person can row `7frac(1)(2)` km/h in still water and he finds that it takes him twice as long to row up as to row down the river. The speed of the stream is
(A) 2km/h (B) 3 km/h (C) `2frac(1)(2) km//h` (D) `3frac(1)(2)km//h`

A

B

B

D

C

A

D

C

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