Uncle Wang drove from place A to place B. He drove 100 kilometers in the first 2 hours. At this speed, it will take a total of 4 hours to go from place A to place B. How far is the distance between places A and B?
王叔叔开车从甲地到乙地，前2小时行了100千米，照这样的速度，从甲地到乙地一共要用4小时，甲乙两地相距多远？
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

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

<result>200</result>