Question

A runner completes the first 10 laps of 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

Answer 1

Answer:

Average speed for first 10 laps = 1 minute, 30 seconds / Lap. = 60 seconds + 30 seconds = 90 seconds / Lap. So, → Total time taken to cover first 10 laps = 10 * 90 = 900 seconds

Step-by-step explanation:

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