It takes 3 hours for a car to travel a section of flat road and a section of mountain road. The speed of traveling on flat road is 60 km/h, and the speed of traveling on mountain road is 40 km/h. How far is this section of road?
一辆汽车走一段平路和一段山路各需要3小时，走平路的速度为60千米/小时，走山路的速度为40千米/小时，这段路有多远？
<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">100 * 3</gadget>
<output>300</output>

<result>300</result>