A tourist bus traveled for 2 hours on the plains and mountains, and finally reached the top of the mountain. It travels 80 kilometers per hour on the plain and 50 kilometers per hour in the mountains. How many kilometers has the tourist bus traveled in total?
一辆旅游大巴，在平原和山区各行了2小时，最后到达山顶．在平原上每小时行驶80千米，在山区每小时行驶50千米，这辆旅游大巴共行驶了多少千米？
<gadget id="calculator">80 * 2</gadget>
<output>160</output>

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

<gadget id="calculator">160 + 100</gadget>
<output>260</output>

<result>260</result>