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Time & Work
Time, Distance and Speed

A can do a piece of work in 12 days, B can do it in 15 days. If they work together for 4 days, how much of the work is left?

Answer: B. 1/3
In 4 days, A completes 4/12 and B completes 4/15. Together they complete 1/3 of the work, leaving 2/3.
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