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:
Choose the correct choice from the following answers
A) 2 B) 4 C) 9 D) 12 E) 15
Sol.   Speed in still water = 1/2 (13+5) kmph = 9 kmph.   Answer 9
<result>C</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: