In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
Options:
(A) 3
(B) 4
(C) 5
(D) 8
(E) 9 Think first, then make a decision. Some random thoughts:
Speed in still water = (11 + 5)/2 kmph = 8 kmph. So the answer is (D).