Two passenger ships A and B set off from Shanghai and Wuhan respectively at the same time, traveling toward each other, with a total length of 1100 kilometers, and met after 25 hours. Ship A traveled 500 kilometers when they met. How many kilometers per hour does boat B travel on average?
甲乙两艘客轮同时从上海和武汉分别开出，相向而行，全长1100千米，经过25小时相遇．相遇时甲船行驶了500千米．乙船平均每小时行多少千米？
<gadget id="calculator">1_100 - 500</gadget>
<output>600</output>

<gadget id="calculator">600 / 25</gadget>
<output>24</output>

<result>24</result>