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Kentucky Derby

Kentucky Derby

Time warp... The Kentucky Derby is resurrecting famous horses!
Secretariat can run one lap per minute.
Seabiscuit can run two laps per minute.
Northern Dancer can run 4 laps per minute.

Question :
If all three horses start at the same time at the same place, how long will it take for each of them to meet back at the starting line?

See answer

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