Multiple choice

Rabinson covers 18 km. at 6 km./hr.,16 km at 8 km./hr. and 30 km at 6 km/hr.Then find average speed in covering the whole distance ?

  1. 6 km/hr.

  2. 6.2 km/hr.

  3. 6.4 km/hr.

  4. 6.5 km/hr.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Average speed = total distance ÷ total time. Total distance = 18 + 16 + 30 = 64 km. Total time = (18/6) + (16/8) + (30/6) = 3 + 2 + 5 = 10 hours. Average speed = 64 ÷ 10 = 6.4 km/hr. The key is to use total distance and total time, not the individual speeds.

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