2 years ago in Time and Work

P can complete a work in 12 days working 8 hours a day. Q can complete the same work in 8 days working 10 hours a day. If both P and Q work together, working 8 hours a day, in how many days can they complete the work?

[A] 5 <sup>5</sup>/<sub>11</sub>
[B] 5 <sup>6</sup>/<sub>11</sub>
[C] 6 <sup>5</sup>/<sub>11</sub>
[D] 6 <sup>6</sup>/<sub>11</sub>
[E] None of these
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