Two birds making a nest each made 10 round trips collecting building materials. If the building materials were located 200 miles from where they were building the nest, what is the total distance the birds covered in the trips?
In one round trip, traveling to and from the building materials location, one bird covers 2*200= <<2*200=400>>400 miles.
If in one round trip one bird covers 400 miles, in 10 round trips, it covers 400*10 = <<400*10=4000>>4000 miles.
Since there were two birds collecting the materials, they covered a combined 4000+4000 = <<4000+4000=8000>>8000 miles collecting the building materials in 10 round trips.
#### 8000