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Four horses are running around a course made up of several concentric circles.
Horse A runs one lap an hour on its course.
Horse B runs two laps an hour on its course.
Horse C runs three laps an hour on its course.
Horse D runs four laps an hour on its course.
All four horses line up at the bottom of the circle and start running their courses at the same time. How many minutes will take until all four horses are lined up nose to nose on a straight line again.
Nope, try again.
The horses must be lined up nose to nose, but the puzzle doesn't say anything about which direction they're facing.
The horses will line up nose to nose 30 minutes after they begin running.
Despite the fact that two horses will be on the far side of the track, the four horses will still be lined up nose to nose.
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