Multiple choice

A bus covers a distance of first 50 km in 40 minutes, next 50 km at a speed of 2 km per minute and the next 30 km at a speed of 1.0 km per minute. What is its average speed during the entire journey?

  1. 61.5 kmph

  2. 55.06 kmph

  3. 82.1 kmph

  4. 80 kmph
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance = 50 + 50 + 30 = 130 km. Time 1 = 40 min. Time 2 = 50 km / (2 km/min) = 25 min. Time 3 = 30 km / (1 km/min) = 30 min. Total time = 40 + 25 + 30 = 95 min = 95/60 hours. Average speed = 130 / (95/60) = 7800 / 95 = 82.1 kmph.

AI explanation

The total distance for the journey is 50 plus 50 plus 30, which equals 130 km. The times taken for the three segments are 40 minutes, 25 minutes for the second 50 km at 2 km per minute, and 30 minutes for the 30 km at 1 km per minute. The total time is 95 minutes, which converts to 95 divided by 60 hours. Applying the average speed formula, 130 divided by (95 divided by 60) gives an average speed of approximately 82.1 km per hour.

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