When building a road, when it reaches (3/8) of this road, there is still 30 meters away from the midpoint. How many meters is the total length of this road?
修一条路，当修到这条路的(3/8)时，离中点还有30米，这条路全长有多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) - (3/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">30 / (1/8)</gadget>
<output>240</output>

<result>240</result>