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A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

4 km/hr
6 km/hr
8 km/hr
Data inadequate
Explanation:
Rate downstream =$ \left(\dfrac{16}{2} \right) $kmph = 8 kmph.
Rate upstream =$ \left(\dfrac{16}{4} \right) $kmph = 4 kmph.
$\therefore$ Speed in still water =$ \dfrac{1}{2} $(8 + 4) kmph = 6 kmph.
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