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 35 seconds, while Melissa's car completes a revolution in 30 seconds. How long will it take them before both cars reach the starting point again simultaneously?
A. 84 seconds
B. 210 seconds
C. 42 seconds
D. 420 seconds
Answer: B
Mathematics
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A. 
B. 
C. 
D. 
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A. x-axis, origin B. x-axis C. Origin D. y-axis
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