A passenger car departs from A at 8:00 am at a speed of 50 kilometers per hour and arrives at B at 12:00 am. How many kilometers are there between A and B?
一辆客车上午8时以每小时50千米的速度从甲地出发，上午12时到达乙地，甲、乙两地相距多少千米？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">4 * 50</gadget>
<output>200</output>

<result>200</result>