The tour bus travels an average of 50 kilometers per hour on the plain and 30 kilometers per hour on the mountain. A tourist bus travels on the plain and the mountain for 2 hours each, and finally reaches the top of the mountain. How far is this journey?
旅游车在平原上平均每小时行50千米，在山区平均每小时行30千米，一辆旅游车在平原和山区各行了2小时，最后达到山顶．这段路程有多远？
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">100 + 60</gadget>
<output>160</output>

<result>160</result>