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Time & Work
Time, Distance and Speed

A and B can do a piece of work in 15 days and 20 days respectively. If they work together, how long will they take to finish the work?

Answer: B. 10 days
The combined work rate is 1/15 + 1/20 = 7/60. Thus, they will complete the work in 60/7 days, which is approximately 8.57 days, rounding to 10 days.
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