tourist bus travels on the plain and the mountain for 2 hours each, 60 kilometers per hour on the plain, 45 kilometers per hour on the mountain, and finally reaches the top of the mountain. How long is the distance?
一辆旅游车在平原和山区各行了2小时，在平原每小时行60千米，在山区每小时行45千米，最后到达山顶，这段路程有多长？
<gadget id="calculator">2 * 60</gadget>
<output>120</output>

<gadget id="calculator">2 * 45</gadget>
<output>90</output>

<gadget id="calculator">120 + 90</gadget>
<output>210</output>

<result>210</result>