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Sofia ran 5 laps around the 400-meter track at her school. For each lap, she ran the first 100 meters at an average speed of 4 meters per second and the remaining 300 meters at an average speed of 55 meters per second. How much time did Sofia take running the 5 laps?

 May 11, 2022
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Sofia took 85 minutes running 5 laps.

 Nov 8, 2022

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