A truck travels 45 kilometers per hour and a car travels 90 kilometers per hour. The big truck travels for 5 hours, and the car travels for 3 hours. Which one of them travels the farthest? How far is it?
大卡车每小时行驶45千米，小轿车每小时行驶90千米．大卡车行驶5小时，小轿车行驶3小时，他们哪一个行的路程远？远多少？
<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">45 * 5</gadget>
<output>225</output>

<gadget id="calculator">270 - 225</gadget>
<output>45</output>

<result>45</result>