car drives from place A to place B. After driving 90 kilometers, there is still (1/5) the full distance from the midpoint of the two places. What is the distance in miles between A and B?
一辆汽车从甲地开往乙地，行了90千米后，离两地的中点还有全程的(1/5)路程．甲、乙两地之间的距离是多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">90 / (3/10)</gadget>
<output>300</output>

<result>300</result>