SOLUTION: When Ace Airlines changed to planes that flew 100 km/h faster than its old one the time of its 2800 km Dallas-Seattle flight was reduced by 30 min. Find the speed of the new plane
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Question 167947This question is from textbook
: When Ace Airlines changed to planes that flew 100 km/h faster than its old one the time of its 2800 km Dallas-Seattle flight was reduced by 30 min. Find the speed of the new planes.
This question is from textbook
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the speed of the old planes Dallas-Seattle in km/hr
Let = the old plane's time Dallas-Seattle in hrs
Given is
km
Also given is
Subtract from both sides
Multiply both sides by
Divide both sides by
Using the quadratic formula
reject this since it is negative
The speed of the new planes is km/hr
check answer:
hrs
OK
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