SOLUTION: 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

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(52813)   (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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