Answer:
By a search on google, I've find that:
For the beginner's trail, there is only one rectangle. For Expert Trail, there are 4 rectangles.
Then in total, we have 5 rectangles.
We know that the combined length is 2000 meters, then the 5 rectangles are equivalent to 2000 meters.
Then each rectangle will be equivalent to:
2000m/5 = 400m.
Now, we know that the beginner's trail has one rectangle, then the length of the beginner's trail is 400 meters long.
The expert's trail has 4 rectangles, then it is:
4*400m = 1600m long.
