Problem
Two trains leave the station at the same time, one heading west and the other east. The westbound train travels at 90 miles per hour. The eastbound train travels at 70 miles per hour. How long will it take for the two trains to be 384 miles apart? Do not do any rounding.
Solution
Step 1 ：\(D = rt\)
Step 2 ：\(384 = (90 + 70)t\)
Step 3 ：\(t = \frac{384}{160}\)
