A passenger car and a freight car respectively depart from A and B at the same time and drive toward each other. The ratio of their speeds is 5:3, and they meet after 4 hours. How many hours does it take for the bus to travel from A to B?
客车和货车分别从甲乙两地同时出发，相向而行，它们速度的比是5：3，经过4小时相遇．客车从甲地到达乙地一共要用多少小时？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(1/4) * (5/8)</gadget>
<output>5/32 = around 0.15625</output>

<gadget id="calculator">1 / (5/32)</gadget>
<output>32/5 = around 6.4</output>

<result>32/5 = around 6.4</result>