B. One train travel 3 miles more than twice the distance another train travels. The total distance traveled by both trains is 800 miles after one hour. If the rate of the slower train represents x,...

Extracted text: B. One train travel 3 miles more than twice the distance another train travels. The total distance traveled by both trains is 800 miles after one hour. If the rate of the slower train represents x, and the rate of the faster train represents xf , what is the correct mathematical expression of the total distance d traveled by both trains?