11. (6 points) It snowed heavily at night, and in the morning, Xiaolong and his father measured the length of a circular path in the garden together, starting from the same point and walking in the same direction. Xiaolong's step length is 54 cm, and his father's step length is 72 cm. After each of them walked one complete circle and returned to the starting point, there were only 60 footprints left in the snow. What is the length of this path? $\qquad$ meters.
【Answer】Solution: The least common multiple of 54 and 72 is $216, 216 \div 72=3, 216 \div 54=4$, which means the father's 3 steps and Xiaolong's 4 steps coincide, at this point there are 6 footprints, the distance is 216 centimeters, and there are a total of 60 footprints,

so the length of the road is $60 \div 6 \times 216=2160$ centimeters.
2160 centimeters $=21.6$ meters.
Therefore, the answer is: 21.6.