In one hour, a boat goes 7 km along the steram and 5 km against the stream. The speed of the boat in still waer (in km/hr) is:  Answers
A) 2	B) 4	C) 6	D) 12	E) 15
Sol.   Speed in still water = 1/2 (7+5) kmph = 6 kmph.   Answer 6
<result>C</result>
In one hour, a boat goes 7 km along the steram and 5 km against the stream. The speed of the boat in still waer (in km/hr) is: