The distance between A and B is 456 kilometers. A passenger car and a truck are traveling towards each other from the two places at the same time. The speed of the bus is 45 kilometers per hour, and the speed of the truck is 36 kilometers per hour. 3 After one hour, how many kilometers are there between the two cars?
甲、乙两地之间的距离是456千米，一辆客车和一辆货车同时从两地相向而行，客车的速度是每小时45千米，货车的速度是每小时36千米，3小时后，两车还相距多少千米？
<gadget id="calculator">45 + 36</gadget>
<output>81</output>

<gadget id="calculator">81 * 3</gadget>
<output>243</output>

<gadget id="calculator">456 - 243</gadget>
<output>213</output>

<result>213</result>