2.55hours. Divide 140 by 55.
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2 hrs and 20 minutes
if you drive at 70 mph, then in 2 hours you will have gone 140. In one minute you will travel 70/60 miles, so the remaining 2 miles will take 1.7 minutes. So, 2 hours and 1.7 minutes.
700/85 = 140/17 = 8 and 4/17 hours
140 miles
(3 hours) x (60 miles/hour) = 180 miles (2 hours) x (70 miles/hour) = 140 miles Total = 180 + 140 = 320 miles