A 8.00-cm tall object is placed 28.8 cm in front of a 18.0-cm focal length converging lens, and an image is formed 48.0 cm in back of the lens that is -13.3 cm tall. The
magnification of the image must be and the negative sign means it is

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).