Someone please help! Due today

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Equation for the calculation double 2 and then add 5

Bring the fraction a/a-4 to a denominator of 16-a^2