Question

4) A cistern can be filled by a tap in 25 minutes and emptied by a waste pipe in 45 minutes. If both pipes are opened together, in what time will the cistern be full ?

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

A cistern can be filled by a tap in 25 minutes and emptied by a waste pipe in 45 minutes. If both pipes are opened together,

$\frac{1}{25} - \frac{1}{45} = \frac{20}{1125} \: \: part \: per \: min$

So,

$\frac{1125 \times 60}{20} = 3375 \: min \\ = 56.25 \: hr$