When Liu Ming went from home to school, he walked for the first half of the distance and took a car for the second half of the distance; when he came home from school, he took the car for the first (1/3) time and walked for the last (2/3) time. As a result, it takes 2 hours longer to go to school than to go home. It is known that Liu Ming walks 5 kilometers per hour and travels 15 kilometers per hour by car, so how many kilometers does Liu Ming travel from home to school?
刘明从家到学校时，前一半路程步行，后一半路程乘车；他从学校回家时，前(1/3)时间乘车，后(2/3)时间步行．结果去学校的时间比回家所用的时间多2小时．已知刘明步行每小时行5千米，乘车每小时行15千米，那么刘明从家到学校的路程是多少千米？
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(7/3) * (1/15)</gadget>
<output>7/45 = around 0.155556</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(7/45) - (2/15)</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">2 / (1/45)</gadget>
<output>90</output>

<result>90</result>