A car travels 210 kilometers in 2 hours. According to this calculation, how many kilometers does the car travel in 6 hours?
一辆汽车2小时行驶210千米，照这样计算，这辆汽车6小时行驶多少千米．
<gadget id="calculator">210 / 2</gadget>
<output>105</output>

<gadget id="calculator">105 * 6</gadget>
<output>630</output>

<result>630</result>