Master Zhang makes 12 parts per hour, and it takes 10 minutes longer for Master Li to make one part than Master Zhang. The work efficiency of Master Zhang is how many times that of Master Li.
张师傅每小时做12个零件，做一个零件的时间李师傅比张师傅多10分钟，张师傅的工作效率是李师傅的多少倍．
<gadget id="calculator">60 / 12</gadget>
<output>5</output>

<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<result>3</result>