not sure what MPR is but if it's 200 MPH it'd take you 15 minutes
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http://www.wolframalpha.com/input/?i=200+miles+at+70mph
Time = Distance / Speed 6800 miles / 200 miles per hour = 34 hours.
That depends on the speed of travel.
Simply divide the distance travelled by the speed - in this case 200/70 = 2 hours 51 minutes.
200 / 25 = 8 hours