Two cars, A and B, start from A and B at the same time, and drive toward each other. It takes 4 hours for A to travel from A to B, and B travels 40 kilometers per hour. When they meet, A travels the entire distance (3/ 5) What is the distance in kilometers between A and B?
甲乙两车分别从A、B两地同时出发，相向而行，甲车从A地到B地需要行4小时，乙车每小时行40千米，相遇时甲车行了全程的(3/5)，A、B两地相距多少千米．
<gadget id="calculator">3 / 5</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">40 / (2/5)</gadget>
<output>100</output>

<gadget id="calculator">4 * (3/5) * 100</gadget>
<output>240</output>

<result>240</result>