A ship sails from port A to port B. It plans to travel 20 kilometers per hour, but actually travels 2.4 kilometers more than planned per hour. After 4.5 hours, it is still 11 kilometers away from port B. Ask for the two ports of AB How many kilometers apart?
一艘轮船从A港开往B港，计划每小时行20千米，实际每小时比计划多行2.4千米，这样行了4.5小时后，离B港还有11千米，求AB两港相距多少千米？
<gadget id="calculator">20 + 2.4</gadget>
<output>22.4</output>

<gadget id="calculator">22.4 * 4.5</gadget>
<output>100.8</output>

<gadget id="calculator">100.8 + 11</gadget>
<output>111.8</output>

<result>111.8</result>