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Time & Work
Time, Distance and Speed

If C can do a piece of work in 20 days and D can do it in 30 days, how long will it take for both C and D to complete the work together?

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