The driver, Uncle Wang, set off from Xiamen to Fuzhou to deliver the goods. It took 7 hours to go there, the speed of the car was 60 km/h, and it took 6 hours to return. How many kilometers is it from Xiamen to Fuzhou?
司机王叔叔从厦门出发到福州送货，去时用了7小时，车的速度是60千米/小时，返回时用了6小时，厦门到福州有多少千米？
<gadget id="calculator">60 * 7</gadget>
<output>420</output>

<result>420</result>