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Time & Work
Time, Distance and Speed

If A can complete a work in 10 days and B can complete the same work in 15 days, how long will they take to complete the work together?

Answer: B. 8 days
A's work rate is 1/10 and B's is 1/15. Together, they work at a rate of 1/10 + 1/15 = 1/6. Therefore, they will complete the work in 6 days.
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