A car drives from place A to place B. It travels the whole distance (1/5) in the first hour. At this time, it is still 45 kilometers away from the midpoint. How many kilometers is the distance between places A and B?
一辆汽车从甲地开往乙地，第一小时行了全程的(1/5)，这时离中点还有45千米，甲乙两地的距离是多少千米？
<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">45 / (3/10)</gadget>
<output>150</output>

<result>150</result>