Mathematics, 29.01.2021 21:40 jstringe424

One teacher can grade an exam in 8 hours. The same exam would take a second teacher 12 hour, and a third teacher would take 10 hours. How long would it take for all 3 teachers worked together?

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One teacher can grade an exam in 8 hours. The same exam would take a second teacher 12 hour, and a t...

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