The car travels 40 kilometers per hour, which is (5/9) the speed of the train. How many kilometers per hour does the train travel?
汽车每小时行驶40千米，是火车速度的(5/9)，火车每小时行多少千米？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">40 / (5/9)</gadget>
<output>72</output>

<result>72</result>