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13 October, 18:50

An airplane flies 21 km in 30 minutes. What is its average speed in kilometers per hour?

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Answers (2)
  1. 13 October, 21:35
    0
    30 minutes is 1/2 of an hour.

    So if you just multiplied 21*2, you would get you answer.

    The answer is:

    42 kilometers per hour
  2. 13 October, 21:44
    0
    Average speed = (distance covered) / (time to cover the distance)

    Average speed = (21 km) / (1/2 hour)

    Average speed = (21/0.5) (km/hour)

    Average speed = 42 km/hr

    A very slow airplane! Maybe an ultralight, a motorized hang-glider, etc.
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