Answer:
43 miles
Explanation:
Distance covered by Travis, d = 129 miles
Time taken by Travis, t = 3 hours
We need to find the distance covered by Travis in 1 hour. It can be calculated using unitary method.
129 miles in 3 hours
Distance covered in 1 hour is,

So, Travis covered a distance of 43 miles in 1 hour. Hence, this is the required solution.