SOLUTION: A jet plane, flying 90 mph faster than a propeller plane, travels 3600 miles in 2 hours less time than the propeller plane takes to fly the same distance. How fast does each plane

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Question 1093868: A jet plane, flying 90 mph faster than a propeller plane, travels 3600 miles in 2 hours less time than the propeller plane takes to fly the same distance. How fast does each plane fly?
Answer by josgarithmetic(39620)   (Show Source): You can put this solution on YOUR website!
                  SPEED         TIME          DISTANCE

JET               r+90         3600/(r+90)     3600

PROPELLER         r            3600/r          3600

Time Difference                 2


Solve for r and evaluate r+90.
-


common denominator is .









or

If choose to use general solution for quadratic equation, the discriminant is .

------compute and find r+90.
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