SOLUTION: on a recent trip, Sararh's car traveled 20 mph faster on the first 110 miles than it did on the remaining 80 miles. The total time for the trip was 4 hr. Find the speed of Sarah's

Question 336523: on a recent trip, Sararh's car traveled 20 mph faster on the first 110 miles than it did on the remaining 80 miles. The total time for the trip was 4 hr. Find the speed of Sarah's car on the first part of the trip.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Rate*Time=Distance
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.

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.

.
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Substituting,

.
.

.
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And finally,

Use the quadratic formula,

Only the positive result makes sense for this problem.

So then

or approximately,
mph

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