Multiple choice

A car covers 3 kilometer in four different speeds respectively by 10 km/hr , 20 km/hr , 30 km/hr , and 60 km/hr. find his average speed of the car? ( in kmph)

  1. 10

  2. 20

  3. 30

  4. 35
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Distance = 3 km for each speed. Time at 10 km/h = 3/10 = 0.3 hr. Time at 20 km/h = 3/20 = 0.15 hr. Time at 30 km/h = 3/30 = 0.1 hr. Time at 60 km/h = 3/60 = 0.05 hr. Total time = 0.6 hr. Total distance = 12 km. Average speed = 12/0.6 = 20 km/h. This is NOT the simple average (which would be 30).

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