A passenger car travels from city A to city B at a speed of 45 kilometers per hour. The bus departs at 8:00 am and arrives at 12:00 am. How many kilometers has this bus traveled in total?
一辆客车以每小时45千米的速度从甲城开往乙城．上午8时发车，12时到达，这辆客车一共行了多少千米？
<gadget id="calculator">45 * 4</gadget>
<output>180</output>

<result>180</result>