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### Discussion :: Boats and Streams

1. 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?

2.  A. 4 km/hr B. 6 km/hr C. 8 km/hr D. Data inadequate

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.