Multiple choice

A marathon runner maintains an average speed of 10 miles per hour for the first 15 miles of a marathon and covers the remaining 11.2 miles at an average speed of 5 miles per hour. How much time does the runner take to complete the marathon?

  1. 3 hours

  2. 3.5 hours

  3. 3.74 hours

  4. 4.24 hours

  5. 4.5 hours
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Time 1 = 15 miles / 10 mph = 1.5 hours. Time 2 = 11.2 miles / 5 mph = 2.24 hours. Total time = 1.5 + 2.24 = 3.74 hours.

AI explanation

Using the formula time = distance divided by speed, the time for the first 15 miles is 15 divided by 10, equaling 1.5 hours. The time for the remaining 11.2 miles is 11.2 divided by 5, equaling 2.24 hours. Adding these two times together gives a total completion time of 3.74 hours.

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