Solve the problem.Cory and Melissa are racing electronic cars around a circular track. They begin at the same time going in the same direction. Cory's car completes a revolution in 45 seconds, while Melissa's car completes a revolution in 40 seconds. How long will it take them before both cars reach the starting point again simultaneously?
A. 720 seconds
B. 144 seconds
C. 72 seconds
D. 360 seconds
Answer: D
Mathematics
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C. - 
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