The distance between A and B is 495 kilometers. A car has been driving from A to B for 3 hours, and the remaining distance is 45 kilometers longer than the already traveled one. What is the average speed of this car in km/h?
甲、乙两地相距495千米，一辆汽车从甲地开往乙地，已经行了3小时，剩下的路程比已经行的多45千米．这辆汽车的平均速度是多少千米/时？
<gadget id="calculator">495 - 45</gadget>
<output>450</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">450 / 6</gadget>
<output>75</output>

<result>75</result>