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Boats and Streams - General Aptitude

Q1:

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?

A 4 km/hr

B 6 km/hr

C 8 km/hr

D Data inadequate

ANS:B - 6 km/hr

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