Multiple choice

A runner started a race at 9 a.m. and ran at a speed of 12 km/h. After completing the race, the runner rested for 20 minutes and then ran back to the starting point at a speed of 18 km/h. The runner reached the starting point at 11.05 a.m. Calculate the total distance covered by the runner during the race.

  1. 63 km

  2. 13 km

  3. 12.6 km

  4. 13.6 km

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

Let the one-way distance be d km. The running time is d/12 + d/18 hours, and the total elapsed time excluding the 20-minute rest is 1 hour 45 minutes, or 1.75 hours. Solving gives d × 5/36 = 1.75, so d = 12.6 km.

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