A ship travels 15 kilometers per hour and can reach the destination in 6 hours. If it travels 18 kilometers per hour, how many hours can it reach the destination? (Answer with proportional knowledge)
一艘轮船每小时行15千米，6小时可以到达目的地，如果每小时行18千米，几小时可以到达目的地？(用比例知识解答)
<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<gadget id="calculator">90 / 18</gadget>
<output>5</output>

<result>5</result>