A passenger car travels 90km per hour, and it is known that the passenger car is faster than the freight car per hour (1/4). How many miles does the truck travel per hour?
一辆客车每小时行90km，已知客车比货车每小时快(1/4)．货车每小时行多少km？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">90 / (5/4)</gadget>
<output>72</output>

<result>72</result>