A train travels an average of 180 kilometers per hour, which is 2.5 times the speed of a car. How many hours does it take for a car to travel 3 hours by train?
一列火车平均每小时行180千米，是一辆汽车速度的2.5倍．火车3小时行驶的路程，汽车需要行驶多少小时？
<gadget id="calculator">180 / 2.5</gadget>
<output>72</output>

<gadget id="calculator">3 / 72</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">180 * (1/24)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>