Linkage DBEF is part of a windshield wiper mechanism, where points O, F, and D are fixed pin connections. At the position shown, θ = 30° and link EB is horizontal. Knowing that link EF has a counterclockwise angular velocity of 4 rad/s at the instant shown, determine the angular velocity of links EB and DB.

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Fig. P15.65 20 mm A E 85 mm D 0 30 mm B