2 years ago in Time and Work

A and B can do a job together in 7 days. A is 1 3/4 times as efficient as B. The same job can be done by A alone in :

[A] 9 <sup>1</sup>/<sub>3</sub> days
[B] 11 days
[C] 12 <sup>1</sup>/<sub>4</sub> days
[D] 16 <sup>1</sup>/<sub>3</sub> days

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