One day after the heavy snowfall, Xiao Ming and his father measured the circumference of a circular garden together. Their starting point and walking direction are exactly the same. Xiao Ming's average step length is 54 cm, and Dad's average step length is 72 cm. Since the footprints of the two people overlap, and they both returned to the starting point after walking around, only 60 footprints were left on the snow. What is the circumference of the flower garden in meters?
大雪后的一天，小明和爸爸共同测一个圆形花圃的周长．他们的起点和走的方向完全相同．小明的平均步长54厘米，爸爸的平均步长72厘米．由于两人的脚印有重合，并且他们走了一圈后都回到起点，这时雪地上只留下60个脚印，这个花圃的周长是多少米．
<gadget id="calculator">60 / 6</gadget>
<output>10</output>

<gadget id="calculator">216 / 100</gadget>
<output>54/25 = around 2.16</output>

<gadget id="calculator">10 * (54/25)</gadget>
<output>108/5 = around 21.6</output>

<result>108/5 = around 21.6</result>