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Two pipes A and B can fill a tank in 12 and 18 hours respectively. How long will they take if opened together?
A10 hours
B6 hours
C7.2 hours
D8 hours
Answer & Solution
Correct answer: C. 7.2 hours
Rate = 1/12 + 1/18 = 3/36 + 2/36 = 5/36. Time = 36/5 = 7.2 hours.
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