Xiao Ming travels from home to school, if he walks 3.5 kilometers per hour, he will arrive at school in 0.6 hours. When returning home from school, speed up 0.5 kilometers per hour, how many hours will it take to get home?
小明从家到学校，若每小时走3.5千米，0.6小时到达学校．从学校返回家时，每小时加快0.5千米，几小时到家？
<gadget id="calculator">3.5 + 0.5</gadget>
<output>4</output>

<gadget id="calculator">0.6 / 4</gadget>
<output>0.15</output>

<gadget id="calculator">3.5 * 0.15</gadget>
<output>0.525</output>

<result>0.525</result>