The length of (3/8) of a rubber rope is 1 meter, and the length of (7/8) after being pulled hard is 3 meters. How much longer is it than the original length?
一根橡皮绳的(3/8)长1米，用力拉后的(7/8)长3米，比原来长了多少米？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">3 / (7/8)</gadget>
<output>24/7 = around 3.428571</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / (3/8)</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">(24/7) - (8/3)</gadget>
<output>16/21 = around 0.761905</output>

<result>16/21 = around 0.761905</result>