If a batch of parts can be completed in 4 hours, then how much of this batch of parts can be completed in 3 hours.
做一批零件4小时可以完成，那么3小时可以完成这批零件的多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 3</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>