Posted by Marcus on Tuesday, June 7, 2011 at 2:01pm.
Seconds in 1 hour = 60 * 60 = 3600
3,600 * 17.6 = 63,360 feet per hour.
5,280 = feet per mile
63,360 / 5280 = 12 miles per hour
90 / 12 = 7.5 hours
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