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Total length of Beijing-Shanghai expressway 1262km.
Let the initial speed of the car be x km/h,

5X+5(X+20)+5(X+20- 10)= 1262

Solve the equation = 74 km/h.

So the first speed is 74 km/h. The second section is 94 km/h. The third section is 84 km/h.

Eight hours after the departure, the car traveled 74*5+(74+20)(8-5)=652 kilometers. That is 652 kilometers from Beijing.

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