help please, this is a khan assignment i can't figure out how to word it but i have screenshots that explains everything

Which expression is equivalent to the expression shown?

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.

Give all possible names for the line shown.calculation tip: lines can be written with either point first.