From point A to point B, the whole journey (3/8) has been done, which is exactly 81 kilometers. How many kilometers are there from point B at this time?
从甲地到乙地，行了全程的(3/8)，正好行了81千米，这时离乙地还有多少千米？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">81 / (3/8)</gadget>
<output>216</output>

<gadget id="calculator">216 - 81</gadget>
<output>135</output>

<result>135</result>