A and B travel from city A to city B at the same time. A rides a bicycle and travels 15 kilometers per hour, and B rides a motorcycle at 55 kilometers per hour. B arrives at B 4 hours earlier than A. The distance between A and B is How many kilometers?
甲乙两人同时从A城到B城，甲骑自行车每小时行15千米，乙骑摩托车每小时行55千米，乙比甲提前4小时到达B城，A城到B城的距离是多少千米？
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">55 - 15</gadget>
<output>40</output>

<gadget id="calculator">60 / 40</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">55 * (3/2)</gadget>
<output>165/2 = around 82.5</output>

<result>165/2 = around 82.5</result>