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Two tap can fill a cistern in 8 hours an...

Two tap can fill a cistern in 8 hours and 10 hours respectively. A third tap can empty it in 6 hours. How long will they take to fill the cistern if all the taps are opened.

Text Solution

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Tap 1 for 8 hour
1 hour for 1/8 cistern
Tap 2 for 10 hours
1 hour for 1/10 cistern
Tap 3 for 6 hours
1 hour for 1/6 cistern
If all are open
`1/8+1/10-1/6`
...
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