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Mathematics, 13.02.2021 18:20 jacky852

Contestants in a dance-a-thon rest for the same amount of time every hour. A couple reta for 9 minutes in 3 hours. How long did they rest in 7 hours?

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Contestants in a dance-a-thon rest for the same amount of time every hour. A couple reta for 9 minut...
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