Xiao Ming spent (1/3) hour doing math homework, which was (1/15) more hours than doing Chinese homework. How much time did he spend doing both kinds of homework? What is the correct column
小明做数学作业用了(1/3)小时，比做语文作业多用(1/15)小时，他做完这两种作业一共用了多少时间？列式正确的是多少
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">(4/15) + (1/3)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>