The car travels 90 kilometers per hour, and the speed of the car is slower than the speed of the train (2/5). How many miles does the train travel per hour?
小汽车每小时行驶了90千米，小汽车的速度比火车的速度慢(2/5)．火车每小时行驶多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">90 / (3/5)</gadget>
<output>150</output>

<result>150</result>