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) 42 seconds
B) 210 seconds
C) 420 seconds
D) 84 seconds

Question

Quizplus · Accepted Answer

To find when Cory and Melissa's cars will both reach the starting point simultaneously, we need to find the least common multiple (LCM) of their lap times. The LCM of 35 and 30 seconds is 210 seconds, meaning both cars will align at the starting point again after 210 seconds.

Solve the Problem. -Cory and Melissa Are Racing Electronic Cars Around a Circular