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Time & Work
Time, Distance and Speed

A and B can complete a work in 12 days and 15 days respectively. If they work together for 3 days, how much of the work is left?

Answer: B. 1/3
In 3 days, A and B together complete (3/12 + 3/15) = 1/4 + 1/5 = 5/20 + 4/20 = 9/20 of the work. Thus, 1 - 9/20 = 11/20 of the work is left.
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