A man paddling his boat from point A on riverside 3 km straight. He wants to reach point B which is 8 km more downstream in the opposite side(see Figure). He can paddle boat and run to C to B, or he could pedaling directly to B, or he could row to some point D between C and B and then run to B. If he can row the boat with a speed of 6 km/hr and run with a speed of 8 km/hr, where should he land in order to reach B as soon as possible? The Answer unit is expressed in km :)

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