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A boat goes 40 km upstream in 8 h and 36...

A boat goes 40 km upstream in 8 h and 36 km downstream in 6 h.The speed of the boat in still water is (A) 6.5 km/h (B) 5.5 km/h (C) 6 km/h (D) 5 km/h

A

B

B

D

C

A

D

C

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