A plain is flying at the height of 5000 metre above the sea level. At a particular point , it is exactly above the submarine floting 1200 metre below the sea level. What is the vertical distance between them

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.