How to calculate the solution fo the zero initial condition of a first order differential equation

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.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

If y varies directly as x2 and y=6 when x=6, find the constant of variation.