two taps can fill a cistern in 10hours and 8 hours. a third tap can empty it in 15 hours. how long will it take to fill the cistern if all the taps are opened at the same time.....20 points question
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Work done by cistern a in 1 hour =1/10
Work done by cistern b in 1 hour=1/8
Work done by cistern c in 1 hour=1/15
Total work done by a b and c in 1 hour =1/10+1/8-1/15
=19/120
Thus it will take 120/19 hrs to fill the cistern
Hope it helps you
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