On Children's Day, the students took a coach to visit Erlong Mountain. The car traveled for 3 hours on the flat road section and the uphill section. The general speed in the plain is 80 km/h, and the general speed in the mountainous area is 40 km/h; finally reached the top of the mountain. How long is this journey?
六一儿童节，学生们乘坐一辆旅游车去二龙山游玩．汽车在平面路段和上山路段各行了3小时，在平原一般车速是80千米/小时，在山区一般车速是40千米/小时；最后到达了山顶．这段路程有多长？
<gadget id="calculator">80 + 40</gadget>
<output>120</output>

<gadget id="calculator">120 * 3</gadget>
<output>360</output>

<result>360</result>