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January 26, 2015

January 26, 2015

Posted by **Joslyn** on Thursday, February 9, 2012 at 7:24am.

- physical Science -
**drwls**, Thursday, February 9, 2012 at 7:30amI assume that you mean "4 to 5 hours" and not 4.5 hours.

In that case, the answer is: Between 400/5 and 400/4 km/s.

That is a range of 80 to 100 km/h

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