At the same speed a boat travelling 50 km upstream and 78 km downstream in 16 hours. Also it can travel 70 km upstream and 104 km downstream, in 22 hours at the same speed of the stream is?

(A) 3 Km/h
(B) 4 Km/h
(C) 6 Km/h
(D) 8 Km/h

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