SOLUTION: How do i work this out?: Two cars are driven around a 10 kilometre track. Both cars leave from the start line at the same time. Car X travels at exactly 40km/h Car Y travels

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Question 970985: How do i work this out?:
Two cars are driven around a 10 kilometre track.
Both cars leave from the start line at the same time.
Car X travels at exactly 40km/h
Car Y travels at exactly 30km/h
How many minutes will it be before they pass the start line together?

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Two cars are driven around a 10 kilometre track.
Both cars leave from the start line at the same time.
Car X travels at exactly 40km/h
Car Y travels at exactly 30km/h
How many minutes will it be before they pass the start line together?
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Car X takes 15 minutes per lap.
Car Y takes 20 per lap.
The LCM (Least Common Multiple) is 300 minutes.
--> 300 minutes.