A tourist bus travels 60 kilometers per hour on the plain and 40 kilometers per hour on the mountain. It takes 2 hours on both the mountain and the plain. How long is the road?
一辆旅游车在平原每小时行60千米，在山区每小时行40千米，在山区和平原都用了2小时，这段路有多长？
<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">120 + 80</gadget>
<output>200</output>

<result>200</result>