When they first met, they walked 1 time (red and blue solid line), of which Jony J walked 25 kilometers (blue solid line);

When they met for the second time, they walked three full distances (all solid lines and dotted lines). It's time for Xiao Jia to go:

25× 3 = 75km

As can be seen from the figure, Jony J walked 1 time, 28km.

Therefore, 1 whole journey: 25× 3-28 = 47 (km)

[Note; Drawing is just a schematic diagram, only used to help analysis. The length of the line segment is not necessarily accurate, such as this problem.