A cargo ship and a passenger ship travel from Wuhan to Shanghai at the same time. The cargo ship travels 25 kilometers per hour. After 5.2 hours, the passenger ship surpasses the cargo ship by 31.2 kilometers. How many kilometers does the passenger ship travel per hour?
一艘货船和客轮同时从武汉到上海，货船每小时行25千米，经过5.2小时客轮超过货船31.2千米．客轮每小时行多少千米？
<gadget id="calculator">31.2 / 5.2</gadget>
<output>6</output>

<gadget id="calculator">6 + 25</gadget>
<output>31</output>

<result>31</result>