A person plans to ride a bicycle from place A to place B in 3 hours and 20 minutes. Because there are 2.5 kilometers of roads being repaired on the way, they can only push the cart and walk on foot. The speed is only 1/3 of that of a car. In the end, it took 3 hours It takes 40 minutes to arrive at B, how many kilometers are there between A and B?
某人骑自行车从甲地去乙地计划用3小时20分钟，由于途中有2.5千米的路面在整修，只能推车步行步行，速度只有汽车的(1/3)，结果用了3小时40分钟才到达乙地，甲乙两地相距多少千米？
<gadget id="calculator">40 - 20</gadget>
<output>20</output>

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

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

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">2.5 / 10</gadget>
<output>0.25</output>

<gadget id="calculator">0.25 * 200</gadget>
<output>50</output>

<result>50</result>