P works twice as fast as Q. If Q alone can complete a work in 12 days, P and Q can finish the work in ___ days ?

– by 0

A. 2
B. 4
C. 5
D. 9

Work done by Q in 1 day = 1/12
Work done by P in 1 day = 2 × (1/12) = 1/6
Work done by P and Q in 1 day = 1/12 + 1/6 = ¼
=> P and Q can finish the work in 4 days

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