Cars A and B leave opposite each other from AB at the same time. Car A encounters car B when it travels the whole distance (5/8). It is known that it will take 12 hours for car B to complete the journey. Find out how many hours it will take for car A to complete the journey. ?
甲乙两车同时从AB两地相对开出，当甲车行了全程的(5/8)时和乙车相遇，已知乙车走完全程要12小时，求甲车行完全程要几小时？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/8) / (3/8)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">12 / (5/3)</gadget>
<output>36/5 = around 7.2</output>

<result>36/5 = around 7.2</result>