A passenger ship sails from port A to port B. It plans to travel 25 kilometers per hour and arrive in 12 hours. Due to the downwind when sailing, the actual travel is 5 kilometers per hour, so how many hours will it take to arrive?
一艘客轮从甲港开往乙港，计划每小时行25千米，12小时可以到达．由于航行时顺风，实际每小时多行5千米，这样需用几小时到达？
<gadget id="calculator">25 + 5</gadget>
<output>30</output>

<gadget id="calculator">12 / 30</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 * (2/5)</gadget>
<output>10</output>

<result>10</result>