It is 3 kilometers from Xiaoming's house to the school. The uphill road is (1/3), the downhill road is (2/5), and the rest is flat road. What fraction is the flat road?
小明家到学校有3千米，上坡路是(1/3)，下坡是(2/5)，剩下是平路，平路是几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>