Question 749783
Two cars are speeding around the race track at different speeds.  One goes around the track in two minutes; the other goes around the track in one minute and thirty seconds.  How often does the faster car pass the slower car?
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The LCM of 2 & 1.5 is 6 minutes, 3*2 = 4*1.5
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Every 6 minutes, both cars are at the starting point.
In the 6 minutes, the fast car makes 4 laps and the slow car makes 3 --> passes 1 time each 6 minutes.
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How often does the faster car pass the slower car? Each 6 minutes.