7. A tap fills a tank in 6 hours. Another tap fills it in 8 hours. The outlet pipe empties it in 12 hours. If all the three taps are opened together, how long will it take to fill the tank?
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Step-by-step explanation:
When we have question like one is filling the tank and other is empting it, then we subtraction as,
Filled in 1 hour = 1/6
Empties in 1 hour = 1/8
Net filled in 1 hour = 1/6 - 1/8
= (8-6)/48
= 2/48
=1/24
So cistern will be filled in 24 hours
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