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Time & Work
Time, Distance and Speed

C can finish a work in 20 days, while D can finish it in 30 days. If they work together, how long will it take to finish the work?

Answer: B. 15 days
C's rate is 1/20 and D's is 1/30. Together, they work at a rate of 1/20 + 1/30 = 1/12. Thus, they complete the work in 12 days.
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