47. A and B are training on an elliptical track, starting from the same point and running in opposite directions. After each completes the first lap and returns to the starting point, they immediately turn around and accelerate for the second lap. During the first lap, B's speed is $\frac{2}{3}$ of A's speed. A's speed for the second lap is $\frac{1}{3}$ faster than the first lap, and B's speed for the second lap is $\frac{1}{5}$ faster than the first lap. It is known that the second meeting point is 190 meters away from the first meeting point (the shortest distance on the track). What is the length of this elliptical track in meters? $\qquad$
Answer: 400