4fe + 3o2 → 2fe2o3 iron combines with oxygen to form rust. given the chemical reaction, how many grams of 4fe + 3o2 would produce 10 kg of rust? a) 7 kg b) 10 kg c) 30 kg d) 70 kg

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).