A and B are walking toward each other from A and B at the same time. A travels 5.5 kilometers per hour, and B travels 4 kilometers per hour. When they meet, A travels an additional 9 kilometers. How many kilometers are there between A and B?
甲乙两人同时从A、B相向而行，甲每小时行5.5千米，乙每小时行4千米，相遇时甲多行9千米，A、B两地相距多少千米？
<gadget id="calculator">5.5 - 4</gadget>
<output>1.5</output>

<gadget id="calculator">9 / 1.5</gadget>
<output>6</output>

<gadget id="calculator">5.5 + 4</gadget>
<output>9.5</output>

<gadget id="calculator">6 * 9.5</gadget>
<output>57</output>

<result>57</result>