A long, level highway bridge passes over a railroad track that is 100 feet below it and

Question:

A long, level highway bridge passes over a railroad track that is 100 feet below it and at right angles to it. If an automobile traveling 45 miles per hour (66 feet per second) is directly above a train engine going 60 miles per hour (88 feet per second), how fast will they be separating 10 seconds later?