The distance between A and B is 400 kilometers. A car departs from A at 8:00 a.m. at a speed of 45 kilometers per hour. By 3:00 p.m., how many kilometers will the bus be from B?
甲、乙两地相距400千米，一辆汽车上午8时出发，以每小时45千米的速度从甲地开出，到下午3时，这辆客车距乙地还有多少千米？
<gadget id="calculator">45 * 7</gadget>
<output>315</output>

<gadget id="calculator">400 - 315</gadget>
<output>85</output>

<result>85</result>