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OpenStudy (anonymous):
A tank can be filled by a large intake pipe in 3 hours or by a small intake pipe in 4 hours. If both intake pipes are opened, how long will it take to fill the tank?
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OpenStudy (anonymous):
1/(1/3+1/4)
OpenStudy (anonymous):
Simplify it
OpenStudy (anonymous):
so, it would be 7/12?
OpenStudy (anonymous):
12/7
OpenStudy (anonymous):
1 5/7 hours?
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OpenStudy (anonymous):
yes
OpenStudy (anonymous):
thank you
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