Three taps A, B, C can fill an overhead tank in 4, 6 and 12

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Three taps A, B, C can fill an overhead tank in 4, 6 and 12 hours respectively. How long would the three taps take to fill the tank if all of them are opened together ?

[SSC GD 2012 Shift 1]

A 2 hrs.

B 4 hrs,

C 3 hrs,

D 5 hrs,