passenger car and a truck depart from A and B at the same time and meet each other on the way after several hours. After meeting, the truck travels for another 5 hours to reach A. At this time, the bus turns around and travels 25% of the distance between A and B after arriving at B. How many hours did it take for the passenger car and the truck to meet each other?
客车和货车分别从甲乙两地同时相向开出，经过若干小时在途中相遇，相遇后又行5小时货车到达甲地，这时客车到乙地后又掉头行了甲乙两地距离的25%．客车和货车从出发到相遇用了多少小时．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(5/4) / 1</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / (5/4)</gadget>
<output>4/5 = around 0.8</output>

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

<result>4</result>