2 hours 37 minutes at 65 mph
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57 mph
(171 miles / 3 hours) x (5,280 feet / mile) x (1 hour / 3,600 seconds) = 83.6 feet/second
Its average speed was 1200/7 = 171.4 mph, approx.
distance/speed = time (miles)/(miles per hour) = (hours)
Distance = rate X time so... Time = Distance/rate Time = 163 miles/80 mph ( which is really miles/hour so both miles cancel ) = 2.04 hours