55mph.
you can solve it using the equation distance=speed x time
your total distance is 714, and you have 2 trains, one traveling some speed, x, and one traveling x+8, both traveling for 7 hours.
your equation would look like this

and you can then solve for x, which would be 47. this is the speed of the slower train, but 47+8=55 with give you the speed of the faster train.
Equivalent fractions can you help add or subtract because it can be easier to simplify.
hope that helped
answer it is right at right write L.C.M
Answer:
C and H
Explanation:
All others are not the same shape, they tend to be pointing in different directions.