A certain river has upper and lower wharves 36 kilometers apart. Every year, two passenger ships A and B with the same speed depart from the two wharves at the same time and go towards each other. One day, when ship A leaves the upstream wharf, something falls off. The object floats on the surface of the water and goes down the water. After 5 minutes, it is 2 kilometers away from Ship A. How many hours is it expected that ship B will encounter this object after departure?
某河有相距36千米的上、下两码头，每年定时有甲、乙两艘船速度相同的客轮分别从两码头同时出发相向而行，一天甲船从上游码头出发时掉下一物，物品浮于水面顺水而下，5分钟后，与甲船相距2千米．预计乙船出发后几小时可以与此物相遇？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">2 / (1/12)</gadget>
<output>24</output>

<gadget id="calculator">36 / 24</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>