When Congcong has to go to school (1/2), Mingming uses less (1/6) than Congcong, how much time does Mingming have to go to school.
聪聪上学要走(1/2)时，明明上学比聪聪少用(1/6)，明明上学要走多少时．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(1/2) * (5/6)</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>