I found this puzzle which simply asks which way was the bicycle going, from its wheel marks on the mud shown in the image
Now there is a simple way to find which mark(line) was made by the front and which was made by the rear wheel because
We know that the tangent drawn anywhere on the line drawn by the rear wheel will always cut the line made by the front wheel . And this is not guaranteed for the front wheel.
How can i use this information to solve it ?