A certain engineering team originally planned to build a teaching building in 280 days, but the construction speed was accelerated by a quarter, and the result was how many days ahead of schedule the task was completed.
某工程队原计划用280天建成一座教学楼，施工时速度加快了四分之一，结果提前多少天完成任务．
<gadget id="calculator">1 / 280</gadget>
<output>1/280 = around 0.003571</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(1/280) * (5/4)</gadget>
<output>1/224 = around 0.004464</output>

<gadget id="calculator">1 / (1/224)</gadget>
<output>224</output>

<gadget id="calculator">280 - 224</gadget>
<output>56</output>

<result>56</result>