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OpenStudy (anonymous):
Working together, two pumps can drain a certain pool in 3 hours. If it takes the older pump 13 hours to drain the pool by itself, how long will it take the newer pump to drain the pool on its own? Do not do any rounding.
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OpenStudy (dayakar):
let the new pump takes to drain the pool = x hr in 1hr the new pump drain the part of the pool = 1/x------(1) can u do the same for older pump?
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