A car drives from place A to place B, traveling (3/8) of the total distance, and there are still 90 kilometers away from the midpoint. How many kilometers are there between A and B? (Solution of column equation)
一辆汽车从甲地开往乙地，行了总路程的(3/8)，离中点还有90千米．甲、乙两地相距多少千米？(列方程解)
<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">90 / (1/8)</gadget>
<output>720</output>

<result>720</result>