If 20 parts are processed in 5 minutes, how many minutes will it take to process 2 parts at this speed?
5分钟加工20个零件，照这样的速度，加工2个零件，需要多少分钟．
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>