Processing a batch of parts, Uncle Zhang takes (3/4) hours to complete (4/9) of this batch of parts, how many hours will it take to complete this batch of parts.
加工一批零件，张叔叔用(3/4)小时完成这批零件的(4/9)，要完成这批零件共需要多少小时．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/9) / (3/4)</gadget>
<output>16/27 = around 0.592593</output>

<gadget id="calculator">1 / (16/27)</gadget>
<output>27/16 = around 1.6875</output>

<result>27/16 = around 1.6875</result>