A boatman can take the same time to row 6.5 km downstream and 3.5 km upstream. His speed in still water 2.5 km/hr. The speed of the stream is.

(A) 0.56 Km/h
(B) 0.60 Km/h
(C) 0.75 Km/h
(D) 0.90 Km/h

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