Does the data in the table show a proportional relationship?

Is the orthocenter of a triangle on the inside ?

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.