The distance between A and B is 527 km. A passenger car drives from Port A to Port B. After driving for 8 hours, it is 71 kilometers away from Port B. What is the average speed of this passenger car?
甲、乙两地之间的距离是527千米．一辆客车从甲港开往乙港，行驶8小时后，离乙港还有71千米，这辆客车的平均速度是多少？
<gadget id="calculator">527 - 71</gadget>
<output>456</output>

<gadget id="calculator">456 / 8</gadget>
<output>57</output>

<result>57</result>