A car drives from Quicksand to Guangzhou. It first drives for 2 hours to arrive at a gas station 140 kilometers away from Quicksand. After refueling, it drives for another 3 hours at the same speed to Guangzhou. How many kilometers is the distance between Quicksand and Guangzhou? (column ratio solution)
一辆汽车从流沙开往广州，先开了2小时到达距流沙140千米的加油站，加油后，又以同样的速度行使了3小时到达广州，流沙与广州相距多少千米？(列比例解答)
<gadget id="calculator">140 / 2</gadget>
<output>70</output>

<gadget id="calculator">70 * 3</gadget>
<output>210</output>

<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<gadget id="calculator">210 + 140</gadget>
<output>350</output>

<result>350</result>