25 w to the sixth power over 10 w to the third power divided by 30 w squared over 5 w.

(25w^6)/(10w^3)  divided by (30w^2)/(5w) =
(25w^6)/(10w^3)  * (5w)/(30w^2)
Multiply across the numerator and across the denominator.
(25 * 5 * w^7) /
(10 * 30 * w^5)
(125 w^7) / (300 w^5) =
(5w^2) / 12