A car can travel 72.8 kilometers per hour, which is 20.5 kilometers faster than a truck. How many kilometers per hour can the truck travel?
小轿车每时能行72.8千米，比货车快20.5千米．货车每时能行多少千米？
<gadget id="calculator">72.8 - 20.5</gadget>
<output>52.3</output>

<result>52.3</result>