At 3:25 p. m., a passenger train and a freight train both left Kalamazoo, Michigan. Right now, the passenger train is 61.5 miles west of Kalamazoo. The freight train is now 49.5 miles east of Kalamazoo. The passenger train averages 16 miles per hour faster than the freight train. What time is it now?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?