Mathematics

Mathematics, 12.07.2019 04:20, janeou17xn

It takes one valve 5 hours to fill the tank
it takes one valve 6 hours to fill the tank
it takes another valve 10 hours to drain the tank
if all 3 valves are open at the same time how long does it take to fill the tank?

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Physics, 30.09.2019 22:20, ryleigh8211

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It takes one valve 5 hours to fill the tank
it takes one valve 6 hours to fill the tank
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