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A cistern can be filled with water
by a pipe in 5 hours and it can
be emptied by a second pipe in 4
hours. If both

By Clara

A cistern can be filled with water
by a pipe in 5 hours and it can
be emptied by a second pipe in 4
hours. If both the pipes are
opened when the cistern is full,
the time in which it will be
emptied is :​

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Clara

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1 thought on “A cistern can be filled with water<br />by a pipe in 5 hours and it can<br />be emptied by a second pipe in 4<br />hours. If both”

  1. Hi..

    (+) sign shows filling efficiency

    (-) sign shows emptying efficiency

    If A and B work simultaneously. Then A will fill 4 units / hour and B will empty 5 units/hour

    If overall 1 unit/hour will be emptied.

    Then full tank will empty in

    total capacityA′s eff.+B′s eff.=204−5=20−1

    =20 hours

    Reply

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