An old computer that can print a document in 6 hours. With the help of a newer model the job can be completed in 2 hours. How long would it take for the newer model to do the job alone?
A. 6 hours.
B. 5 hours.
C. 4 hours.
D. 3 hours.
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সঠিক উত্তরঃ
D.
3 hours.
Explanation:
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