The hour hand of the big round school clock is 80 centimeters long. How many meters does the needle tip travel in one revolution?
学校圆形大钟的时针长80厘米，它的针尖转动一周走过的路程是多少米？
<gadget id="calculator">2 * 3.14 * 80</gadget>
<output>502.4</output>

<result>502.4</result>