Three taps A, B and C can fill an overhead tank in 6 hours, 8 hours and 12 hours
respectively. How long would the three taps take to fill the empty tank, if all of them are
opened together?
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Answer:
work done by A in 1 hours=1/6
work done by B in 1 hours=1/8
work done by C in 1 hours=1/12
total time=1/6+1/8+1/12
=8/48+6/48+4/48
=18/48
=48/18
=2.667 hours
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