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How to do the last question on page 55 of the second volume of the fourth grade (People's Education Edition)
Solution: Suppose that when the car B passes the car A 10 km, the car B travels for x hours, ***85x km.

A drive x+2 hours ***65(x+2) kilometers.

Car b overtook car a 10 km.

85x-65(x+2)= 10

x=7

A: B has been driving for seven hours.

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