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A Ford car left A to B and an Audi car left B to A at the same time. The speed of the Ford car to that of the Audi car was 4:3. The Ford decreased its speed by 20% and the Audi car increased its speed by 25% after they had passed each other. When the Ford car reached B, the Audi car was still 20 km away from A. Find the distance between A and B in km.

 Feb 1, 2021
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The distance is 400 km.

 Feb 2, 2021

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