Two cars, A and B, drive from two places 324 kilometers apart at the same time. After 6 hours, they meet on the way. The speed of car A is twice that of car B. How many kilometers per hour does the car travel? (solution by equation)
甲乙两辆汽车从相距324千米的两地同时相对开出，经6小时后在途中相遇，甲车的速度是乙车的2倍．甲车每小时行多少千米？(用方程解)
<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<gadget id="calculator">6 + 12</gadget>
<output>18</output>

<gadget id="calculator">324 / 18</gadget>
<output>18</output>

<gadget id="calculator">2 * 18</gadget>
<output>36</output>

<result>36</result>