Question:
To fill a certain tank, pipes A, B and C take 20 minutes, 15 minutes and 12 minutes respectively. If the three pipes are opened every alternate minute, how long will it take to fill the tank?
To fill a certain tank, pipes A, B and C take 20 minutes, 15 minutes and 12 minutes respectively. If the three pipes are opened every alternate minute, how long will it take to fill the tank?
Updated On: Sep 26, 2024
- 5 minutes
- 10 minutes
- 12 minutes
- 15 minutes
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The Correct Option is D
Solution and Explanation
Part filled by 3 pipes in 3 minutes \(=\frac{1}{20}+\frac{1}{15}+\frac{1}{12}=\frac{3+4+5}{60}=\frac{1}{5}\)
1/5th of the tank is filled in 3 minutes then whole tank is filled in 5 x 3 = 15min
Hence, option D is the correct answer.The correct option is (D): 15 minutes
1/5th of the tank is filled in 3 minutes then whole tank is filled in 5 x 3 = 15min
Hence, option D is the correct answer.The correct option is (D): 15 minutes
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