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Mathematics 16 Online
OpenStudy (anonymous):

Working alone 2 metal crushers can each process one truckload of cans in 25 minutes. After the 2 machines have been working for 6 minutes, they are joined by a third machine that by itself could process one truckload in 20 minutes. How long after the 2 machines start working will one truckload of cans be processed?

OpenStudy (anonymous):

I know answer is 10, but I don't know how...

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