Multiple choice

A person walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is

  1. 8.3

  2. 7.2

  3. 5

  4. 3.6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total distance = 3 km (to school) + 3 km (back) = 6 km. Total time = 30 min + 20 min = 50 min = 50/60 hours = 5/6 hours. Average speed = Total Distance / Total Time = 6 / (5/6) = 36 / 5 = 7.2 km/h.

AI explanation

The total distance walked to the school and cycled back is 3 km plus 3 km, totaling 6 km. The total time taken is 30 minutes plus 20 minutes, which is 50 minutes, or 5 divided by 6 of an hour. Using the average speed formula, 6 km divided by (5 divided by 6) hours gives an average speed of 7.2 km/h.

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