Tim and Rick bath can run at speed err and walk at speed aw, with 1'11- } 11.. They set e tdgeth er en a journey at distance D. Rick 1.IIralks half of the distance and runs the other half. Tlm walks hatf of the time and runs the other half. How long does it take Rick to never the distance D\"? Express the time taken by Rick in terms of tin 1:1,, and D. I View Available Hintts}