13.Two pipes can fill the cistern in 5 hours and 12hours respectively, while thethird empty it in 20 hours. If allpipes are open in how manyhours the cistern will be filled.
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Step-by-step explanation:
(A and B are filling pipe and C is empty pipe)
If all pipes are kept open then unit/hr filled:
A+B−C
=4+3−6
= 1 units/hr
Empty tank will be filled in
T.Ceffiency=121=12 hrs
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