To make the same parts, A made 42 pieces in 4.2 hours, which is exactly equal to the number of parts B made in 3.5 hours. How many times does B make parts per hour that A makes per hour?
做同样的零件，甲4.2小时做了42个，正好和乙3.5小时做的零件个数相等．乙每小时做的零件个数是甲每小时做的多少倍？
<gadget id="calculator">42 / 3.5</gadget>
<output>12</output>

<gadget id="calculator">42 / 4.2</gadget>
<output>10</output>

<gadget id="calculator">12 / 10</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>