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Time & Work
Time, Distance and Speed

If C can finish a work in 24 days and D can finish the same work in 36 days, how long will it take for them to complete the work together?

Answer: A. 14.4 days
C and D's combined work rate is 1/24 + 1/36 = 5/72. Therefore, they will complete the work together in 72/5 = 14.4 days.
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