A pedal boat goes 12 km upstream and 14 km downstream in 3 hours. It goes 15 km upstream and 10.5 km downstream in 3 hours 15 minutes. The speed of the boat in still water is?

(A) 8 Km/h
(B) 9 Km/h
(C) 10 Km/h
(D) 15 Km/h

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