Xiaoming spends (2/5) hours doing homework every night, and Xiaojun spends (3/7) hours every night. Who spends more time? How much?
小明每天晚上写家庭作业用(2/5)小时，小军用(3/7)小时，谁用的时间多一些？多多少？
<gadget id="calculator">15 / 35</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">14 / 35</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/7) - (2/5)</gadget>
<output>1/35 = around 0.028571</output>

<result>1/35 = around 0.028571</result>