Discussion :: Boats and Streams

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?
Answer : Option B
Explanation :
Rate downstream =\([\frac { 16 } { 2 }]\)kmph = 8 kmph.
Rate upstream =\([\frac { 16 } { 4 }]\)kmph = 4 kmph.
Speed in still water = \(\frac { 1 } { 2 }\)(8 + 4) kmph = 6 kmph.
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