Xiao Ming spent (1/2) hours doing math homework and (2/5) hours doing Chinese homework. How many hours did he spend on math homework and Chinese homework?
小明做数学作业用了(1/2)小时，做语文作业用了(2/5)小时，做数学作业和语文作业一共用了多少小时？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) + (2/5)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>