In cities, the area in which rain water can seep into the ground is reduced. water flows over roads, then the runoff is carried out to sea through drainage systems. how does the runoff from cities affect ocean systems?
a.
ocean systems are improved by receiving more water.
b.
ocean systems are damaged with more pollutants.
c.
ocean systems are improved by the addition of nutrients.
d.
ocean systems are damaged with the loss of sediments.

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).