The wheel diameter of a car is 1 meter. If the wheel speed is 8 revolutions per second when driving, take π≈3. Try to calculate the speed of the car in kilometers per hour?
一辆汽车的轮子直径1米，若行驶时车轮转速为8周/秒，取π≈3，试计算这辆汽车的行驶速度为每小时多少千米？
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