A tourist bus travels on a plain at a speed of 50 km/h for 3 hours, and then at a speed of 30 km/h for 2 hours. How many kilometers is this distance?
一辆旅游车以50千米/时速度在平原行驶了3小时，又以30千米/时的速度行驶了2小时．这段路程有多少千米？
<gadget id="calculator">50 * 3</gadget>
<output>150</output>

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

<gadget id="calculator">150 + 60</gadget>
<output>210</output>

<result>210</result>