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Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

Correct Answer: 12 min

Explanation:


Part filled by A in 1 min = 1 .
20



Part filled by B in 1 min = 1 .
30



Part filled by (A + B) in 1 min = 1 + 1 = 1 .
20 30 12


∴ Both pipes can fill the tank in 12 minutes.


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