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Time & Work
Time, Distance and Speed

A can do a work in 30 days, B can do it in 45 days. If they work together for 10 days, how much work is left?

Answer: A. 1/3
In 10 days, A and B together complete 10/30 + 10/45 = 1/3 of the work, leaving 2/3 of the work.
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