Distance of the Earth from the Sun, r_e = 1.5 × 10⁸ km = 1.5 × 10¹¹ m
Time period of the Earth = T­_e
Time period of Saturn, T_s = 29. 5 T_e
Distance of Saturn from the Sun = r_s 
From Kepler’s third law of planetary motion, we have
T = (4π²r³ / GM)^1/2
For Saturn and Sun, we can write
r_s³ / r_e³  =  T_s² / T_e²
r_s = r_e(T_s / T_e)^2/3
= 1.5 × 10¹¹ (29.5 T_e / T_e)^2/3
= 1.5 × 10¹¹ (29.5)^2/3
= 14.32 × 10¹¹ m
Hence, the distance between Saturn and the Sun is 1.43 × 10¹² m.