Two trains A and B leave at the same time from two places 300 kilometers apart, and the distance is still 80 kilometers after 2 hours. Car A travels 60 kilometers per hour, how many kilometers per hour does Car B travel? (column equation solution)
甲乙两列火车同时从相距300千米的两地相对开出，2小时后还相距80千米．甲车每小时行60千米，乙车每小时行多少千米？(列方程解答)
<gadget id="calculator">300 - 80</gadget>
<output>220</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">220 - 120</gadget>
<output>100</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<result>50</result>