Faster on Interstate or Local Roads?

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In large cities with dense traffic, a driver must consider whether it is faster to travel on congested interstate highways or on local roads with less traffic. The answer can be calculated with the formula where
is distance,
is the rate of travel, and
is the travel time. With varying levels of congestion on an interstate, it is not always easy to estimate which route is quickest.
distance (April 2013)
rate
time
travel
car
trip
Contributed by: Kelvin Mischo
Open content licensed under CC BY-NC-SA
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"Faster on Interstate or Local Roads?"
http://demonstrations.wolfram.com/FasterOnInterstateOrLocalRoads/
Wolfram Demonstrations Project
Published: April 19 2013