There is a force of gravity between any 2 objects, so there must be one between e. g. a building and the Earth. The force of gravity increases with the mass of the object, since earth is so heavy, the force acting on it must be very large. But why the earth isn’t fallign towards the building?

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).