Relational Algebra

Find the titles of the movies along with their directors that have been shown in all theaters in New York City. Assume that all movies in all theaters were booked at least once.

Schemas:

- Theaters(tID, name, location)

- Auditoriums(tID, aID, number of seats: integer)

- Movies(mID, title, running time: integer, genre, director, release date:integer)

- Booking(tID, aID, cID, mID, bID, seat number, date:integer, year:integer, time:integer)

- Customers(cID, name, street, city)

I know that the following will give me all info on movies booked and the theaters the movies were booked in for New York City,

but I just can't figure out how to express the question fully in relational algebra. Please help!