Ill give you 20 if you me with this

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

An episode of a television show is 60 minutes long when it originally airs with commercials. on a dvd without commercials, the episode is only 417 minutes long. how many1-minute commercials did the episode include when it originally aired? write and solve an equation to justify your answer.

Can someone me and plz do the problem