The total length of the runway in the stadium is 400 meters, the ratio of the length of the curved part to the straight part is 3:4, how much shorter is the curved part than the straight part
体育场内跑道总长是400米，其中弯道部分与直道部分长度之比为3：4，弯道部分比直道部分短多少
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) / (4/7)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>