Need some help with math now

Question

A commercial jet and a private airplane fly from Denver to Phoenix. It takes the commercial jet 1.6 hours for the flight, and it takes the private airplane 2.4 hours. The speed of the private airplane is 185 miles per slower than the speed of the commercial jet. Using the variable r

 to stand for speed of the commercial jet in miles per hour, set up an equation to find how fast the commercial jet is flying. Place the expression for the commercial jet on the left hand side of the equation.

Answer 1

Let r = speed of jet

Then, r - 185 = speed of private plane

Distance = (Rate)(Time)

Since the two planes travel the same distance, 1.6r = 2.4(r - 185)

1.6r = 2.4r - 444

-0.8r = -444

r = 555 mph