Teacher Li goes to work and rides a bicycle for 15 kilometers per hour, and can reach the school in 0.25 hours. If she walks instead and can only walk 5 kilometers per hour, how many hours will it take her to get to school?
李老师上班，骑自行车每小时行15千米，0.25小时可以到达学校．如果她改为步行，每小时只能走5千米，那么她要用多少小时才能到达学校？
<gadget id="calculator">0.25 / 5</gadget>
<output>0.05</output>

<gadget id="calculator">15 * 0.05</gadget>
<output>0.75</output>

<result>0.75</result>