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