Asked by Kayla

a worker has a new pump and an old pump. the new pump can fill a tank in five hours and the old pump can fill the same tank in 7 hours write and solve an equation for the time it will take both pumps to fill one tank if the pumps are used together.
Answered by Reiny
rate of old pump = tank/7
rate of new pump = tank/5
combined rate = tank/7 + tank/5
= (5tank + 7tank)/35 = 12tank/35

combined time = tank/(12tank/35)
= 35/12
= 2 11/12 hours = 2hours and 55 minutes
Answered by Prosper
2 Hours 55minutes
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