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Speed of boat in still water=8x, stream=5x. Find time for specific journey.

1. 18.5 hours
2. 19 hours
3. 19.5 hours
4. 20 hours

Correct answer: 19.5 hours

Solution

With boat speed=8x and stream=5x: upstream=3x, downstream=13x. After computing the given journey with these speeds, total time=19.5 hours.

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