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

Correct Answer: 6 km/hr

Explanation:

Rate downstream =	❨	16	❩kmph = 8 kmph.
		2

Rate upstream =	❨	16	❩kmph = 4 kmph.
		4

∴ Speed in still water =	1	(8 + 4) kmph = 6 kmph.
	2

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