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There are 630 dishes that need to be rinsed. John can rinse 70 of them in minutes by himself. It will take his friend Bob 105 minutes to rinse these...

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

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