Three taps A, B and C can fill a tank in 20, 24 and 30 hours respectiv – McqOptions

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1.	Three taps A, B and C can fill a tank in 20, 24 and 30 hours respectively. How long (in hours) would the three taps take to fill the tank if all of them are opened together?
A.	8
B.	12
C.	9
D.	6
Answer» B. 12

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