The distance between a and B is 700 km. A bus and a freight car run from a and B at the same time. The speed of the bus is 80 km. The speed ratio of the bus to the freight car is 4:3. How long will the distance between the two cars be 280 km?

Three hours

The bus and the truck leave from the two stations at the same time, and meet 15 kilometers away from the midpoint. Given the speed ratio of the bus and the truck is 4:3, find the distance between the two places

Suppose the speed of freight car is 3x, then the speed of passenger car is 4x, and the distance between two places is y
∴y/2+15=y/(4x+3x)4x①
y/2-15=y/(4x+3x)3x②
Y = 210
The distance between a and B is 210 km

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