A car traveling at a certain constant speed takes 2 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 75 kilometers per hour. At what speed, in kilometers per hour, is the car traveling?
71.5
72
72.5
73
73.5
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设速度为x 1/x-1/75=2/3600
设速度为x
1/x-1/75=2/3600