The speed of a certain boat in still water is 18 kilometers per hour, and the speed of water is 2 kilometers per hour. It takes 15 hours for the boat to travel upstream from A to B. What is the distance between A and B in kilometers?
某船在静水中的速度是每小时18千米，水速是每小时2千米，这船从甲地到乙地逆水行驶需15小时，则甲、乙两地相距多少千米．
<gadget id="calculator">18 - 2</gadget>
<output>16</output>

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

<result>240</result>