Three taps A, B and C can ﬁll a tank in 20, 30 and 36 hours respecti – McqOptions

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1.	Three taps A, B and C can ﬁll a tank in 20, 30 and 36 hours respectively. If all the taps are opened together, then in how many hours will the tank be ﬁlled?
A.	6
B.	9
C.	12
D.	15
Answer» C. 12

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