Table: yellow_coach_vehicles
Columns: model
built
quantity
seats
length
engine

Question: What is the Model of the Engine with 29 Seats Built in 1941–1942?
SQL: SELECT "model" FROM yellow_coach_vehicles WHERE "seats" = 29 AND "built" = '1941–1942'

Question: What is the Quantity of the engine Model PG-2901?
SQL: SELECT "quantity" FROM yellow_coach_vehicles WHERE "model" = 'pg-2901'