Baizhai is 20km away from Zhengzhou, and a bus from Baizhai to Zhengzhou can travel 60km in 2 hours. How many hours does this bus take to reach its destination? (answer with ratio)
白寨距郑州有20km，一辆公交车从白寨开往郑州，2小时可以行60km，照这样计算．这辆公交车几小时可到达目的地？(用比例解答)
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">40 / 60</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>