A boat travels 18 kilometers per hour in still water with a speed of 2 kilometers per hour. It takes 15 hours for the boat to sail upstream from point A to point B. How many kilometers is the distance between places A and B?
某船在静水中每小时行18千米，水流速度是每小时2千米．此船从甲地逆水航行到乙地需要15小时．求甲、乙两地的路程是多少千米？
<gadget id="calculator">18 - 2</gadget>
<output>16</output>

<gadget id="calculator">16 * 15</gadget>
<output>240</output>

<result>240</result>