A train travels from City A to City B. It was originally planned to travel 60 kilometers per hour and arrive in 15 hours. It actually travels 90 kilometers per hour. How many hours did it actually take to travel from City A to City B? (Solve with ratio)
一列火车从甲城到乙城，原计划每小时行60千米，15小时到达，实际每小时行90千米，从甲城到乙城实际用了几小时？(用比例解)
<gadget id="calculator">60 * 15</gadget>
<output>900</output>

<gadget id="calculator">900 / 90</gadget>
<output>10</output>

<result>10</result>