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 P and Q work together, working 8 hours a day, in how many days can they complete the work?
[LIC (AAO), 2005]
Answer: Option D
According to the question,
Since, P can complete a work in 12 days working for 8 hours a day.