Answer:
75 miles per hour
Explanation:
Assuming the trains are traveling at the same rate
d = rt is the formula we are using
The total distance is 600
train1 is d= r* 3.5 hours
train 2 is d = r * 4.5 hours
Adding the distances together to get the total distance
d total = r* 3.5 hours + r * 4.5 hours
600 = 3.5r + 4.5 r
600 = 8r
Divide each side8
600/8 = 8r/8
75 = r
75 miles per hour