In one hour,a boat goes 13 km along the stream and 5 km against the stream.The speed of the boat in still water (in km/hr) is :	Select the correct option:
A) 3  B) 5  C) 8  D) 9  E) 10
Solution   Speed in still water =1/2(13+5)kmph.= 9 kmph. Answer 9
<result>D</result>
In one hour,a boat goes 13 km along the stream and 5 km against the stream.The speed of the boat in still water (in km/hr) is :