From place A to place B, someone walked the entire distance (3/8), and there is still 15 kilometers away from the midpoint of the journey. How many kilometers are there between places A and B?
从甲地到乙地，某人走了全程的(3/8)，离全程的中点还有15千米，甲乙两地相距多少千米？
<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">15 / (1/8)</gadget>
<output>120</output>

<result>120</result>