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In connection with the actual life, make up a practical problem, so that the equation listed is 90 / x = 130 / x + 20
Don't you know that x + 20 is the denominator?
A. B. C is on a straight line, B is the midpoint, AB is 90km away, AC is 130km away. A car arrives at point C after 20 minutes from point A. how many kilometers per minute is the speed of the car?
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