SOLUTION: when ace airlines changed to planes that flew 100 km/h faster than its old ones, the time of its 2800 km Dallas-Seattle flight was reduced by 30 min. Find the speed of the new plan

Question 29963: when ace airlines changed to planes that flew 100 km/h faster than its old ones, the time of its 2800 km Dallas-Seattle flight was reduced by 30 min. Find the speed of the new planes.
Answer by Paul(988) (Show Source): You can put this solution on YOUR website!
let the speed be x (orignal)
increased speed = x+100
30 minutes =0.5hours
Equation:

a=0.5, b=50, c=-280000

Simplfy and you get two solutions:
x=-800 and x=700
Remove the negavtive
x=700
700+100=800

Hence, the speed of the new planes is 800km/h
Paul.

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