In one hour, a boat goes 11 km along the stream and 3 km against the stream. the sped of the boat in still water (in km/hr) is :
Answers:	A) 3	B) 5	C) 7	D) 9	E) 10
Solution   Speed in still water= 1/2(11+3) km/hr= 7kmph. Answer 7
<result>C</result>
In one hour, a boat goes 11 km along the stream and 3 km against the stream. the sped of the boat in still water (in km/hr) is :