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Time & Work
Time, Distance and Speed

If C can do a work in 30 days and D can do it in 45 days, how long will it take for C and D to complete the work together?

Answer: C. 22.5 days
The combined work rate of C and D is 1/30 + 1/45 = 1/18. Therefore, they will complete the work in 18 days.
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