The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is__________________?
(A) 0.40 cm
(B) 0.20 cm
(C) 0.10 cm
(D) 0.05 cm
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