A ship sails from port A to port B, travels 25 kilometers per hour, and arrives at port B after 12 hours. Driving 20 kilometers per hour when returning, how many hours will it take to return to Port A?
一艘轮船从甲港开往乙港，每个小时行驶25千米，12小时后到达乙港．返回时每小时行驶20千米，需要几个小时才能回到甲港？
<gadget id="calculator">12 / 20</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">25 * (3/5)</gadget>
<output>15</output>

<result>15</result>