From A to B, if the speed of the vehicle is increased (1/9) than the original, you can arrive 20 minutes earlier than the scheduled time, such as driving 72 kilometers at the original speed, and then increase the speed (1/3) than the original , just arrived 30 minutes earlier than the scheduled time, how many kilometers is the distance between A and B?
从甲地去乙地，如果车速比原来提高(1/9)，就可比预定的时间提前20分钟赶到，如先按原速行驶72千米，再将车速比原来提高(1/3)，就比预定时间提前30分钟赶到，甲、乙两地相距多少千米？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 + (1/9)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">1 / (10/9)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">20 / (1/10)</gadget>
<output>200</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">1 / (4/3)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">200 * (1/4)</gadget>
<output>50</output>

<gadget id="calculator">30 / 50</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">72 / (2/5)</gadget>
<output>180</output>

<result>180</result>