car travels from A to B. When I went there, I climbed the mountain and could only drive at a speed of 40 km/h for 2 hours. After reaching the top of the mountain, I went downhill and traveled at a speed of 50 km/h for another 2 hours. How many kilometers is the one-way distance between places A and B?
一辆汽车从甲地到乙地．去时是翻山爬坡，只能以40千米/时的速度行驶2小时，到达山顶后是下坡，以50千米/时速度又行2小时．甲乙两地的单边路程是多少千米？
<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">80 + 100</gadget>
<output>180</output>

<result>180</result>