SOLUTION: A small airplane flies 1120 miles with an average speed of 280 miles per hour. 2 hours after the plane leaves, a Boeing 747 leaves from the same point. Both planes arrive at th

Question 921605: A small airplane flies 1120 miles with an average speed of 280 miles per hour. 2 hours after the plane leaves, a Boeing 747 leaves from the same point. Both planes arrive at the same time; what was the average speed of the 747 ?

Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
_____________________rates___________time_________distance
SMALL________________280_____________t+2__________1120______
747___________________r_______________t___________1120______

Two equations in the two unknowns r and t.
Solve the system for r.
Answer by MathTherapy(10551) (Show Source): You can put this solution on YOUR website!

A small airplane flies 1120 miles with an average speed of 280 miles per hour. 2 hours after the plane leaves, a Boeing 747 leaves from the same point. Both planes arrive at the same time; what was the average speed of the 747 ?

Time small airplane traveled for: , or 4 hours
Boeing 747 takes 2 hours less, or 4 � 2, or 2 hours
Speed of 747: , or mph
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