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A man can row 30 km upstream and 44 km d...

A man can row 30 km upstream and 44 km downstream in 10 hrs . Also , he can row 40 km upstream and 55 km downstream in 13 hrs . Find the speed of the man in still water .

A

3km/h

B

3.5km/h

C

4km/h

D

4.5km/h

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