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2015-06-16T15:06:33+05:30

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Let the speed of boat in still water be "x" km/hr and the distance between the two coastal towns be "d" km.
Then,
Downstream:
 \frac{d}{x+2} = 5

Upstream:
 \frac{d}{x-2} = 6

x = 22 km/hr
2 5 2