Naughty measured the height of the building and found that the shadow length of the building on the flat ground was 5.4 meters. At the same time, he erected a 2-meter-long bamboo pole on the ground and measured the shadow length of 1.8 meters. How many meters is the height of the building?
淘气测量楼房高度，量得楼房在平地上影长5.4米，他同时把2米长的竹杆直立在地上，量得影长1.8米，楼房的高度是多少米？
<gadget id="calculator">2 / 1.8</gadget>
<output>1.111111</output>

<gadget id="calculator">1.111111 * 5.4</gadget>
<output>5.999999</output>

<result>5.999999</result>