A motor boat can row to a place 112 km away and come back in 44 hours. The time to row 42 km with the stream is same as the time to row 24 km against the stream. Find the speed of boat in still water?

(A) 2.3 Km/h
(B) 3.5 Km/h
(C) 5.5 Km/h
(D) 6.7 Km/h