speed = distance/time
time = distance/speed = (133mi)/(80mi/h) = 1.7h (rounded)
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At 60 mph you travel 1 mile per minute. At 80 mph it is 60/80 x 60 seconds = 45 seconds.
600/80 = 60/8 =30/4 = 15/2 = 7.5 hours
80 mph for 1 hour will displace you 80 miles.
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
530 / 80 = 6.625 hours