Multiple choice

Rakesh covers 12 km at 6 km/hr, 36 km at 9 km/hr and then 32 km at 4 km/hr. Find the approximate average speed in covering the whole distance.

  1. 4.2 km/hr

  2. 5.52 km/hr

  3. 5.71 km/hr

  4. 5 km/hr
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance = 12 + 36 + 32 = 80 km. Total time = 12/6 + 36/9 + 32/4 = 2 + 4 + 8 = 14 hours. Average speed = 80 / 14 = 5.714 km/hr.

AI explanation

The average speed is calculated by dividing the total distance travelled by the total time taken. The total distance is 12 plus 36 plus 32, which equals 80 km. The time taken for each segment is 2 hours, 4 hours, and 8 hours respectively, summing to 14 hours. Dividing 80 km by 14 hours gives an approximate average speed of 5.71 km per hour.

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