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Boat takes 4 hours upstream and 2.5 hours downstream for same distance D. Find D (given additional speed info).

1. 40 km
2. 44 km
3. 48 km
4. 52 km

Correct answer: 48 km

Solution

Using upstream time=4h, downstream time=2.5h, and the given speed information, solving gives D=48 km.

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