A Police Department Has Set Up a Speed Enforcement Zone

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,a = 210 feet from one end and b = 130 feet from the other end (see figure) .​ ​ Find the length l of the zone.Round your answer to two decimal places.
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A) 286.98 ft
B) 276.98 ft
C) 266.98 ft
D) 246.98 ft
E) 256.98 ft