vincentv6789 vincentv6789

20-12-2020
Mathematics

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There are 600 dishes that need to be rinsed. Tony can rinse them in 120 minutes by himself. It will take his friend Ravi 60 minutes to rinse these dishes. How long will it take them if they rinse these 600 dishes together

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ChoiSungHyun ChoiSungHyun

20-12-2020

Step-by-step explanation:

1 / (1/120 + 1/60) = 40 minutes.

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