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Speed of a boat in still water is 12 km/hr. Find the speed of the current.

1. 2 km/hr
2. 3 km/hr
3. 4 km/hr
4. 5 km/hr

Correct answer: 4 km/hr

Solution

Given boat speed=12 km/hr and the time conditions from the full question, solving the upstream/downstream time equations yields current speed=4 km/hr.

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