Distance Rate and Time Problem

[happylagirl]

Hello, can I please get help on setting up the following problem.

"A small airplane flies 810 miles from Los Angeles to Portland, OR, with an average speed of 270 miles per hour. An hour and a half after the plane leaves, a Boeing 747 leaves Los Angeles for Portland. Both planes arrive in Portland at the same time. What was the average speed of the 747?

 

[HallsofIvy]

Hello, can I please get help on setting up the following problem.

"A small airplane flies 810 miles from Los Angeles to Portland, OR, with an average speed of 270 miles per hour.

At 270 mi/hr, it will take 810 mi/270 mi/hr= 810/270 hrs. How long is that?

An hour and a half after the plane leaves, a Boeing 747 leaves Los Angeles for Portland. Both planes arrive in Portland at the same time. What was the average speed of the 747?

Now that you know how long it took the "small airplane" to fly that distance, you know it took the 747 one and a half hours less- so how long did it take the 747 to fly 810 miles? The average speed is 'distance divided by time'.

 

[happylagirl]

Thank you, breaking it down really helped.