A train travels 180 kilometers per hour, which is 120 kilometers faster than a car. If it takes 3 hours to travel by train from City A to City B, how many hours does it take to travel by car?
一列火车每小时行驶180千米，比一辆汽车的速度快120千米．从甲城到乙城火车行驶了3小时，汽车需要行驶多少小时？
<gadget id="calculator">180 - 120</gadget>
<output>60</output>

<gadget id="calculator">3 / 60</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">180 * (1/20)</gadget>
<output>9</output>

<result>9</result>