A train departs from Station A at 8:00 am, and travels 50 kilometers per hour. After 2 hours, another train departs from Station B at the same speed, and the two trains meet at 12:00 noon. How many kilometers are there between A and B?
一列火车于上午8时从甲站开出，每小时行50千米，经过2小时，另一列火车以同样的速度从乙站开出，中午12时两车相遇．甲、乙两站相距多少千米？
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">12 - 8 - 2</gadget>
<output>2</output>

<gadget id="calculator">50 * 2 * 2</gadget>
<output>200</output>

<gadget id="calculator">100 + 200</gadget>
<output>300</output>

<result>300</result>