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Mathematics, 06.03.2020 23:46 yes1225

A runner completes the first 10 laps of a 15-lap race at an average speed of 1 minute and thirty seconds per lap. How fast will the runner's average lap time need to be for the last five laps if they want to have average per-lap speed of one minute and twenty-five seconds for the entire race?

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A runner completes the first 10 laps of a 15-lap race at an average speed of 1 minute and thirty sec...
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