A boat running downstream covers a distance of 22 km in 4 hours while for covering the same distance upstream, it takes 5 hours. What is the speed of the boat in still water?
5 kmph
4.95 kmph
4.75 kmph
4.65 kmph
Explanation:
Speed downstream $=\dfrac{22}{4}\text{ = 5.5 kmph}$
Speed upstream $=\dfrac{22}{5}\text{ = 4.4 kmph}$
Speed of the boat in still water $=\dfrac{5.5+4.4}{2}\text{ = 4.95 kmph}$