The distance between earth and Saturn is 1.2 billion km(746 miles) so if 28,000= 1 hr then 1,200,000,000÷28,000 is 42857.14286 or 42,857.14 (1,785.71 days. or 4.89 years)
There is no algebraic way of isolating X unfortunately. For these equations, you have to solve with numerical approximation. I suggest Newtons method if you know calculus.
