SOLUTION: Imogene's car traveled 624 miles averaging a
Certain speed. If the car had gone 4 mph faster the trip would have taken 1 hour less. Find the average speed.
Algebra.Com
Question 563293: Imogene's car traveled 624 miles averaging a
Certain speed. If the car had gone 4 mph faster the trip would have taken 1 hour less. Find the average speed.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = speed of the car
Let = time for trip
given:
(1)
(2)
-----------------------
(2)
and
(1)
Substitute this into (2)
(2)
(2)
(2)
(2)
(2)
Use quadratic formula
( I can ignore the (-) square root )
Her average speed is 48 mi/hr
check answer:
(1)
(1)
(1)
and
(2)
(2)
(2)
OK
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