------- ----_____ A police department has set up a speed enforcement zone on a s

Question

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A police department has set up a speed enforcement zone on a straight length of highway. A patrol car is parked parallel to the zone, 200 feet from one end and 150 feet from the other end (see figure). Find the length l of the zone and the measures of the angles A and B (in degrees). (Round your answers to two decimal places.) l = 250 ft A = 38.87 B = 53.13 Find the minimum amount of time (in seconds) it takes for a vehicle to pass through the zone without exceeding the posted speed limit of 45 miles per hour. (Round your answer to two decimal places.) sec

Explanation / Answer

Minimum time takes place when vehicle moves from maximum allowable speed = 45 miles/hour 1 mile = 5280 foot so speed of vehicle is 45*5280 foot/hour = 237600 foot / hour = 237600/3600 foot/second = 66 foot / second. so for passing 250ft time taken = 250/66 = 3.78 seconds

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