One copy machine can make 20 copies a minute, and a second copy machine makes 15 copies a minute. If the two copies work together, how long would it take them to make 2100 copies?

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সঠিক উত্তর: 60 minutes। ব্যাখ্যা:

One copy machine can make 20 copies a minute, and a second copy machine makes 15 copies a minute. If the two copies work together, how long would it take them to make 2100 copies?

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