Question 1174116: One morning, Justin drove 3 hours before stopping to eat lunch at Chick-fil-A. After lunch, he increased his speed by 10 mph. If he completed a 450-mile trip in 8 hours of driving time, how fast did he drive in the morning?
Found 3 solutions by ikleyn, ewatrrr, MathTherapy:
Answer by ikleyn(52812)   (Show Source):
You can put this solution on YOUR website! .
Is the 450-mile route the total or partial distance ?
Is 8-hour driving time the total driving time or only partial time ?
Had the problem be formulated correctly, these questions would not occur.
Answer by ewatrrr(24785)  (Show Source):
You can put this solution on YOUR website!
Hi,
Justin drove 3 hours before stopping & then increased his speed by 10 mph
he completed a 450-mile trip in 8 hours of driving time
how fast did he drive in the morning?
Let x be the morning speed. D = rt
3x + 5(x+10) = 450mi
8x - 400mi
x = 50 mi/hr was Justin's morning speed
Wish You the Best in your Studies.
Answer by MathTherapy(10555)  (Show Source):
You can put this solution on YOUR website!
One morning, Justin drove 3 hours before stopping to eat lunch at Chick-fil-A. After lunch, he increased his speed by 10 mph. If he completed a 450-mile trip in 8 hours of driving time, how fast did he drive in the morning?
Let speed in the morning be S
Then speed after lunch = S + 10
We then get the following DISTANCE equation: 3S + 5(S + 10) = 450
3S + 5S + 50 = 450
8S = 400
Speed in the morning or 
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