Min’s home is 28 km away from the school, and it takes 1 hour for the whole journey. In addition to the car, there is also a distance to walk. The speed of the car is 36 km/h, and the speed of walking is 4 km/h. How many hours will it take to walk.
阿民家到学校有28km，全程需要1h，除汽车之外，还需步行一段路，汽车的速度为36km/h，步行的速度是4km/h，则需要步行多少小时．
<gadget id="calculator">36 - 28</gadget>
<output>8</output>

<gadget id="calculator">36 - 4</gadget>
<output>32</output>

<gadget id="calculator">8 / 32</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>