If Zhang Ming walks 3.6 kilometers per hour from home to school, it takes 0.3 hours to reach the school. If the walking speed is increased to 4 kilometers per hour, how many hours will it take to reach the school?
张明从家到学校，如果每小时走3.6千米，0.3小时到达，如果步行速度提高到每小时4千米，需要多少小时到达学校？
<gadget id="calculator">0.3 / 4</gadget>
<output>0.075</output>

<gadget id="calculator">3.6 * 0.075</gadget>
<output>0.27</output>

<result>0.27</result>