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Algebra - Work and Time

There are 630 dishes that need to be rinsed. John can rinse them in 105 Minutes by himself. It will take his friend Bob 70 minutes to rinse these dishes. How long will it take them it they rinse these 630 dishes together (see attachment)


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John's one-minute work = 1/105

Bob's one-minute work = 1/70

Combined one-minute work of ...

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