A signal sound device
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A sound signaling device
Depends on the country the boat is being used in
A Sound Signaling Device.
18 Feet
From the statement of the problem, if w is the width, the area is 2w2 , the product of the width and the length, which is stated to be twice the width. Since 2w2 must be less than 50, w2 < 25, and the width must be less than 5 meters.