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Two athletes take 36 s and 48 s per lap of a circular track. They start together from the starting line. After how many seconds are both first back at the starting line together?

Competition practiceRaces & Circular Tracks
  • A144 s
  • B84 s
  • C72 s
  • D288 s

Step-by-Step Solution

They are together at the start after a common multiple of the lap times: LCM(36, 48) = 144 s.
Answer: A) 144 s

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