MPH = Miles Per Hour
Maria drives 75 MPH from starting point x. 75 * 3 (3 hours later) will give us
225.
Maria would be 225 miles from the starting point.
Ming drives at 54 MPH. 54 * 3 = 162.
Ming would be 162 miles away from the starting point x.
Now we have the amount each went. We need to find the sum of them.
225 + 162 = 387.
In 3 hours, they will be 387 miles apart.
