In one hour, a boat goes 9 km along the stream and 5 km against the stream. The speed of the boat in still water (in km/hr) is:	Pick
A) 2	B) 4	C) 7	D) 12	E) 15
Sol.   Speed in still water = 1/2 (9+5) kmph = 7 kmph.   Answer 7
<result>C</result>
In one hour, a boat goes 9 km along the stream and 5 km against the stream. The speed of the boat in still water (in km/hr) is: