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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?
4 km/hr
6 km/hr
8 km/hr
Data inadequate
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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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