working together, two pumps can drain a certain pool in 4 hours. if it takes the older pump 9 hours to drain the pool by itself,
how long will it take the newer pump to drain the pool on its own?
2 answers:
5 hours because u subtract 9 from 4 u get 5 hours
Answer: Number of hours newer pump needed to drain is given by

Step-by-step explanation:
Since we have given that
Number of hours taken by two pumps = 4 hours
Work done by two pumps = 
Number of hours taken by older pump = 9 hours
Work done by older pump = 
According to question, work done by new pump would be

So, Number of hours newer pump needed to drain is given by

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<h2><u>
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<em>Expression:</em>


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