In the United states speed limits are given in miles per hour. in Canada they are written in kilometers per hour what would speed limit sign say in Canada if it was equivalent to a sign that said 65 miles per hour in the us

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?