In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water in km/hr is:
3 km/hr
5 km/hr
8 km/hr
9 km/hr
Explanation:
| Speed in still water =$ \dfrac{1}{2} $(11 + 5) kmph = 8 kmph. |