The illumination of an object by a light source is directly proportional to the strength of the sourcé aħd Inversely proportional to the square of the distance from the source. If two light sources, one two times as strong as the other, are placed 13 ft apart, how far away from, the stronger light source should an object be placed on the line between the two sources so as to receive the least illumination? (Round your answer to two decimal places.) ft

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