- #1
darklich21
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Homework Statement
You allow yourself 35 minutes to drive 25 miles to the airport, but are caught in heavy traffic and average 22 miles/hour for the first 15 minutes. What must your average speed be on the rest of the trip if you are to get there on time? Express your answer in miles/hour.
Homework Equations
D=vt
The Attempt at a Solution
This was confusing, but this is how i started. I did a little dimensional analysis and did (25mil/35min) x (60min/1hr)= 42.857 mil/hr. From what I understand, this is what you need to do to get to the airport on time. I'm going 22miles/hour for the first 15 mins, meaning, i only have (35-15) = 20 mins left to get to the airport on time. Then I did 42.857-the miles i orginally traveled, which in this case was 22, leaving me with 20.857 miles to go.
So I used D=vt.
20.857=(v)(20min). V=1.04mil/hour
This would be the speed I would need to be traveling for the next 20 mins in order to get to the airport on time.
Is this correct?