Two cars, A and B, set off from A and B at the same time and drive towards each other. It takes 4 hours for A to travel from A to B. B travels 15 kilometers per hour. When they meet, A travels the entire distance ( 3/5). How many kilometers are there 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4小时，乙车每小时行15千米，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">4 * (3/5)</gadget>
<output>12/5 = around 2.4</output>

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

<gadget id="calculator">(12/5) / (2/5)</gadget>
<output>6</output>

<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<result>90</result>