P alone can complete a piece of work in 6 days and Q alone can complete the same piece of work in 12 days. In how many days can P and Q together complete the same piece of work?
Solution
Correct Answer: Option B
P in one day can do 1/6th of the work
Q in one day can do 1/12th of the work
Together in 1 day, they can do (1/6)+(1/12) = 1/4th of the work
Hence, they can do the whole work together in 4 days.
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