There is a towering flagpole on the school playground, and a 2.5-meter-high bamboo pole next to it. At 9 o'clock in the morning, it was clearly measured that the shadow of the bamboo pole was 2 meters long, and the shadow of the flagpole was 6.4 meters long. How many meters is the flagpole? (Answer with proportional knowledge)
学校操场上有一根高耸的旗杆，旁边有一根2.5米高的竹竿．上午9时明明测得竹竿的影子长2米，旗杆的影子长6.4米．旗杆是多少米？(用比例知识解答)
<gadget id="calculator">6.4 * 2.5</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>