The speed of a car is 71 km/h, and it takes 2 hours to travel from Taicheng to Guangzhou. How many kilometers is the road from Taicheng to Guangzhou?
一辆汽车的速度是71千米/时，从台城到广州它要行2小时．台城到广州的公路长多少千米？
<gadget id="calculator">71 * 2</gadget>
<output>142</output>

<result>142</result>