group of students walked from the school to the factory at a speed of 5 km/h. After walking for 1 hour, a student went back to school to pick up things. He went back to school at a speed of 7.5 km/h. After picking up things (not counting the time for picking up things), he immediately chased the team at the same speed. As a result, he was 2.5 kilometers away from the factory. Overtake the team at the kilometer. Q: How much is the distance from the school to the factory?
一队学生从学校步行前往工厂参观，速度为5千米/时．走了1小时后，一名学生回学校取东西，他以7.5千米/时的速度回学校，取了东西后(取东西的时间不计)立即以同样的速度追赶队伍，结果在距离工厂2.5千米处追上队伍．问：学校到工厂的路程是多少？
<gadget id="calculator">5 / 5</gadget>
<output>1</output>

<gadget id="calculator">1 * 7.5</gadget>
<output>7.5</output>

<gadget id="calculator">2.5 / 5</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 * 7.5</gadget>
<output>3.75</output>

<gadget id="calculator">5 - 2.5</gadget>
<output>2.5</output>

<gadget id="calculator">7.5 + 3.75 + 2.5</gadget>
<output>13.75</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 7.5</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 - 1</gadget>
<output>0.5</output>

<gadget id="calculator">13.75 / 0.5</gadget>
<output>27.5</output>

<result>27.5</result>