Question 974549: Imogene's car traveled 420 mi averaging a certain speed. If the car had gone 10 mph faster, the trip would have taken 1 hour less. Find the average speed.
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39618)   (Show Source):
You can put this solution on YOUR website! generalizing the description with variables,
Imogene's car traveled d miles averaging a certain speed. If the car had gone k mph faster, the trip would have taken h hour less. Find the average speed, r.
_______________________rate______________time______________distance
Certain________________r_________________t_________________d
IfFaster_______________r+k_______________t-h_______________d
KNOWN
h, k, d
UNKNOWN
r, t
BASIC RELATIONSHIP, EQUATION
RT=D relating rate, time, distance
SYSTEM OF EQUATIONS
Solve the system for r and t.
Answer by MathTherapy(10552)  (Show Source):
You can put this solution on YOUR website!
Imogene's car traveled 420 mi averaging a certain speed. If the car had gone 10 mph faster, the trip would have taken 1 hour less. Find the average speed.
Average speed: 
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