Multiple choice

If the first 20 km is covered with a speed of 40 km/hr and the next 20 km is covered with a speed of 20 km/hr, then what is the average speed during the journey?

  1. 57.6 km/hr

  2. 40.3 km/hr

  3. 26.6 km/hr

  4. 20.2 km/hr
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Average speed = Total distance / Total time. Total distance = 20 + 20 = 40 km. Time 1 = 20/40 = 0.5 hr. Time 2 = 20/20 = 1 hr. Total time = 1.5 hr. Average speed = 40 / 1.5 = 26.66 km/hr.

AI explanation

The time taken for the first 20 km is 20 divided by 40, which is 0.5 hours, and the time taken for the next 20 km is 20 divided by 20, which is 1 hour. Using the average speed formula of total distance divided by total time, the total distance of 40 km is divided by the total time of 1.5 hours. This gives an average speed of 26.6 km/hr.

Keep practicing — related questions