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The acceleration of a particular sports car is proportional to the difference between 300 ​km/h and...

The acceleration of a particular sports car is proportional to the difference between 300 ​km/h and the velocity of this sports car. If this machine can accelerate from rest to 105 ​km/h in 9 ​s, how long will it take for the car to accelerate from rest to 210 ​km/h?

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