At a train station freight trains depart at a rate of 2 trains every 30 minutes and passanger train depart at a rate of 1 train every 90 minutes. at this rate how many total trains will depart from the station in a 12 hour hour period

The heaviest 16% of all men in weight weigh more than how many pounds ?

What is the missing step in this proof ?

Hii1977 cleaner shrimp are a species of shrimp that clean parasites from other organisms. fish allow the shrimp to eat the parasites in their mouth. the shrimp get a source of nutrition. the relationship between the shrimp and the fish is this association indicates that for the smaill aneser arecommensal,mutualistic,or parasitic for the begger one the anser are the shrimp and fish benefit each other , the shrimp harm the fish, or the fish do not benetit from the shrimp