How do you do number 15?

I’m which figure is point g an orthocenter

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.

Pls yall i really need the answer fr fr