Determining radial distance between clocks

Question

Assignment:

Consider a Schwarzchild black hole of mass M=15Ms where Ms is the mass of the sun.  Two stationary clocks are on the same radial line, one at r1 = 300GMs and the other at r² = 10Rs where Rs is the radius of the sun.

(a) If 10³ seconds elapse on the clock at r², determine the amount of time (in seconds) that will elapse on the clock at r¹.
(b) Determine the radial distance between the two clocks.Compare your result to what it would be if the space surrounding this mass were flat.

Provide complete and step by step solution for the question, use formulas.