Question 30519
420T=480(1.5-T) T BEING THE TIME FOR THE 420 MPH TRIP

SOLVING FOR T WE GET 420T=720-480T OR 900T=720 OR T=720/900 OR T=.8 HOURS

THE 420 MPH TRIP TOOK .8 HOURS. THE DISTANCE THEN IS 420X.8 OR 336 MILES

THE 480 MPH TRIP THE TOOK 1.5-.8 OR .7 HOURS. 480X.7=336 MILES.