From city A to city B, you can take the expressway or take the train. It takes 3.5 hours for a car to travel 120 kilometers per hour. If you take the train instead, it is a car (5/6) per hour, how long can you arrive?
从A城到B城可以从高速公路上走，也可以坐火车去．一辆小汽车每时行120千米走要3.5小时．如果改乘火车，每时是小汽车的(5/6)，多少时可以到达？
<gadget id="calculator">120 * 3.5</gadget>
<output>420</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">120 * (5/6)</gadget>
<output>100</output>

<gadget id="calculator">420 / 100</gadget>
<output>21/5 = around 4.2</output>

<result>21/5 = around 4.2</result>