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Mara and alex are running laps around a track. Alex completes a lap every 45 secs and Mara every 36. If they starts at the same time, how long will it be until they cross the start line together? Plz its for homework that is due TOMORROW...

Respuesta :

Answer:

180

Step-by-step explanation:

Keep multiplying 45 until you get a number divisible by 36. This is called the least common multiple.

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