The two brothers go from home to school. The younger brother walks 3km per hour, and the elder brother walks 4km per hour. The elder brother left 10 minutes late and the two arrived at the school at the same time, asking for the distance from the school to home?
兄弟二人由家去学校弟弟每小时走3km，哥哥每小时行4km．哥哥晚出发10分钟两人同时到校，求学校离家的路程？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/6) / (1/12)</gadget>
<output>2</output>

<result>2</result>