Do a quick drawing showing the plane's flight to and from Las Vegas, and label the information:
Question: How long did it take to get to Las Vegas?
.__________________> to Las Vegas The number of miles going=number of miles returning
<_________________ from Las Vegas
Then make a table:
rate * time = Distance
(longer flight) 432 mi/h * t = 432t= 4320 mi
(shorter flight) 480 mi/h * 9 hours = 480 (9)=4320 mi
432t=4,320 Just solve for "t," and you have your answer.
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