Question

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 empty tank. If all of them are opened together

Answer 1

answer is 72/27 hrs i.e 2.666
a one hour work is 1/6
b one hour work is 1/8
c one hour work is 1/12
so add all these and we get 27/72 and this one hour work of three taps opened at same Time
..reverse 27/72 I.e answer 2.666

Answer 2

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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