The first child has 2 hours at noon. During this period, his eating time takes up (1/7), his lunch break takes up (4/5), and the rest is the time spent on the road. ?
第一的孩中午有2小时时间，在这段间内他吃饭时间占(1/7)，午休时间占(4/5)，剩下时是路上用去的时间路上用去的时间几之？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (1/7) - (4/5)</gadget>
<output>2/35 = around 0.057143</output>

<result>2/35 = around 0.057143</result>