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 50 seconds, while Melissa's car completes a revolution in 45 seconds. How long will it take them before both cars reach the starting point again simultaneously?
A. 90 sec
B. 900 sec
C. 180 sec
D. 450 sec
Answer: D
Mathematics
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A. 
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D. 
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