A searchlight rotates at a rate of 3 revolutions per minute. The beam hits a wall located 9 miles away and produces a dot of light that moves horizontally along the wall. How fast (in miles per hour) is this dot moving when the angle 0 between the beam and the line through the searchlight perpendicular to the wall is ? Note that d0ldt 3(27) = 67. Speed of dot = mph.

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