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1. Soil at a site consists of two layers. The top layer has permeability k units and bottom layer has permeability 5k units. If the thickness of both the layers is equal, then what is the average permeability in the vertical direction ?
(A): (5/3)k units
(B): (5/6)k units
(C): (6/5)k units
(D): 3k units
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