Xiao Ming rides a bicycle from home to school, travels 800 meters per minute, arrives in 4.5 minutes, and travels 600 meters per minute after school, how many minutes will it take to get home?
小明从家骑自行车去学校，每分钟行800米，4.5分钟到达，放学时每分钟行600米，这样要几分钟到家？
<gadget id="calculator">4.5 / 600</gadget>
<output>0.0075</output>

<gadget id="calculator">800 * 0.0075</gadget>
<output>6</output>

<result>6</result>