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1. There are two taps in water tank. The first tap pumps water in the tank and the escond one drains it out. The first tap takes 30 minutes to make the tank full and the second tap needs 40 minutes to drain that water out. If both taps are opened at the same time, how long will it take to make a half-full tank?
- A. 1 hour
- B. 1 hour
- C. 1 hour
- D. 1 hour
Answer: Option A
Explanation:
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