A tourist bus travels on a plain and a mountain road for 2 hours and 3 hours respectively. It is known that the driving speed on the plain is 60 km/h and the speed on the mountain road is 30 km/h. How many kilometers is the total length of this journey?
一辆旅游车在平原和山路分别行了2小时和3小时，已知平原上行驶速度为60千米/时，山路上行驶速度为30千米/时，这段路程共长多少千米？
<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

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

<result>210</result>