A uniform meter rule is pivoted at 80 cm mark. two forced 0.2n and 0.5n are applied at 70cm mark and 90cm mark respectively. if the metre is kept in equilibrium by the forces, what is the height of the metre rule

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).