Four taps can individually fill a cistern of water in 1h, 2h, 3h and 6 – McqOptions

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1.	Four taps can individually fill a cistern of water in 1h, 2h, 3h and 6h, respectively. If all the four taps are opened simultaneously, the cistern can be filled in how many minutes?
A.	20
B.	40
C.	30
D.	35
Answer» D. 35

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