Three pipes can fill (or empty) a cistern in 1,2 and 3 hours while working alone. If allthe three pipes are opened together, the time taken to fill (or empty) the cistern? a.6 hrs b.6/11 hrs c.3 hrs d.1.5 hrs

Three pipes can fill (or empty) a cistern in 1,2 and 3 hours while wor

1.	Three pipes can fill (or empty) a cistern in 1,2 and 3 hours while working alone. If allthe three pipes are opened together, the time taken to fill (or empty) the cistern? a.6 hrs b.6/11 hrs c.3 hrs d.1.5 hrs
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Three pipes can fill (or empty) a cistern in 1,2 and 3 hours while working alone. If allthe three pipes are opened together, the time taken to fill (or empty) the cistern? a.6 hrs b.6/11 hrs c.3 hrs d.1.5 hrs

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