Justin calculates the perimeter of a rectangle with a length of 2x-3 and width of X+4. He tells his teacher the answer is 3x-1. Is he correct or incorrect and why?

When visiting his parents, tyler drives at an average speed of 42 km/h through urban areas, and at an average speed of 105 km/h along the motorway. his journey usually takes him 2.5 hours. one day when there is a fog, he sets off 1 hour early and only manages to average 28 km/h in urban areas and 60 km/h on the motorway. he arrives 30 minutes late. how long was tyler journey?