A car drives from City A to City B, which is 180 kilometers away. After driving for (2/5) hours, the distance from the midpoint is 10 kilometers, at this speed. How long does it take to reach City B?
一辆汽车从甲城开往相距180千米外的乙城，行驶(2/5)小时后，距离中点10千米，照这样的速度．到达乙城，共需要多长时间？
<gadget id="calculator">180 / 2</gadget>
<output>90</output>

<gadget id="calculator">90 - 10</gadget>
<output>80</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">80 / (2/5)</gadget>
<output>200</output>

<gadget id="calculator">180 / 200</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>