At the same time and place, the ratio of the height of the object to the length of its shadow is 3:1. Now there is a tall building with a height of 15 meters. What is the length of its shadow? (Solved with proportional knowledge)
在同一时间同一地点，物体的高度与其影长的比是3：1，现在有一座高15米的高楼，这时它的影长是多少米？(用比例知识解决)
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<result>5</result>