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If a man's rate with the current is 12 km/hr and the rate of the current is 1.5 km/hr then man's rate against the current is?

9 km/hr
6.75 km/hr
5.25 km/hr
7.5 km/hr

Correct Answer: 9 km/hr

Explanation:

Let the rate against the current be x km/hr.
Then, (12 - x) / 2 = 1.5
⇒ 12 - x = 3
⇒ x = 9 km/hr

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