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?
A. 60 minutes
B. 105 minutes
C. 122 minutes
D. 140 minutes
সঠিক উত্তরঃ
A.
60 minutes
Explanation:
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