A state trooper is hidden 30 feet from a highway. One second after a truck passes; the angle θ between the highway and the line of observation from the patrol car to the truck is measured.
a. If the angle measures 15˚, how fast is the truck traveling?
b. If the angle measures 20˚, how fast is the truck traveling?
c. If the speed limit is 55 miles per hour and a speeding ticket is issued for speeds of 5 miles per hour or more over the limit, for what angle should the trooper issue a ticket?

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why not 30tan(15)

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