Charles can do a job in 1 hour, Bill can do the same job in 2 hours, and Bob can do the job in 3 hours. How long does it take them to do the job working together?
A. 6/11 hours
B. 1/2 hours
C. 6 hours
D. 1/3 hours
E. 1/6 hours
সঠিক উত্তরঃ
A.
6/11 hours
Explanation:
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