Uncle Li drives from place A to place B, which is 480 kilometers away, on a business trip. He traveled 180 kilometers in the first 1.5 hours. According to this calculation, how many hours will it take for Uncle Li to reach B? (Answer with proportional knowledge)
李叔叔驾车从甲地到相距480千米的乙地出差．前1.5小时行了180千米，照这样计算，李叔叔还要多少小时才能到达乙地？(用比例知识解答)
<gadget id="calculator">480 - 180</gadget>
<output>300</output>

<gadget id="calculator">180 / 1.5</gadget>
<output>120</output>

<gadget id="calculator">300 / 120</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>