The distance between A and B is 306.5 kilometers. A car travels from A to B at 64.2 kilometers per hour. After 3.5 hours, how many kilometers will it be from B?
甲乙两地相距306.5千米，一辆汽车从甲地到乙地，每小时行64.2千米，3.5小时后，距乙地还有多少千米？
<gadget id="calculator">64.2 * 3.5</gadget>
<output>224.7</output>

<gadget id="calculator">306.5 - 224.7</gadget>
<output>81.8</output>

<result>81.8</result>