Mathematics, 25.07.2019 19:00, countryboy42

Arunner 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? 1 minute and five seconds 1 minute and eight seconds 1 minute and ten seconds 1 minute and fifteen seconds 1 minute and twenty seconds

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