During the "October" golden week, Xiaoming's family took a long-distance bus to play. The speed of the car in the urban area is 55 km/h, and the speed on the expressway is 85 km/h. The car travels in the urban area and on the expressway for 3 hours, and finally arrives at the destination. How long is the distance? long?
"十一"黃金周，小明全家乘长途汽车去游玩．汽车在市区的速度为55千米/时，在高速公路上的速度为85千米/时，汽车在市区和高速公路上各行了3小时，最后到达目的地，这段路程大约有多长？
<gadget id="calculator">85 * 3</gadget>
<output>255</output>

<gadget id="calculator">55 * 3</gadget>
<output>165</output>

<gadget id="calculator">255 + 165</gadget>
<output>420</output>

<result>420</result>