Richard is driving home to visit his parents. 135{\rm mi} of the trip are on the interstate highway where the speed limit is 65{\rm mph} . normally richard drives at the speed limit, but today he is running late and decides to take his chances by driving at 73{\rm mph} . how many minutes does he save?

time spent = 0.2276

Explanation:

given data

distance = 135 mi

usual speed = 65 mph

today speed = 73 mph

solution

we get here time that is express as

time =    ...................1

usual time =  = 2.0769 h

today time = = 1.8493 h

so we get here time spent as

time spent = 2.0769 h - 1.8493 h

time spent = 0.2276

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