Cars A and B leave opposite each other at the same time and meet each other in 6 hours. When they met, car A traveled 60 kilometers longer than car B. It is known that the speed ratio of cars A and B is 11:9, how many kilometers does car A travel per hour?
甲、乙两车同时从两地相对开出，6小时相遇．相遇时甲车比乙车多行60千米．已知甲乙两车的速度比是11：9，甲车每小时行多少千米？
<gadget id="calculator">11 + 9</gadget>
<output>20</output>

<gadget id="calculator">11 / 20</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(11/20) - (9/20)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">60 / (1/10)</gadget>
<output>600</output>

<gadget id="calculator">(11/20) / 6</gadget>
<output>11/120 = around 0.091667</output>

<gadget id="calculator">600 * (11/120)</gadget>
<output>55</output>

<result>55</result>