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2014-12-21T10:21:38+08:00

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I am not sure about this one, but of you follow the formula for speed:
Distance / Time = Speed
You will do this:

7.2 x 10^4 meters / 1 hour = Speed

72000 meters / 1 hour = 72,000 meters/hour

So, in this method, the answer is:
72, 000 meters per hour.
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