A beam of light passes through $285.60 \mathrm{~cm}$ of water of index $1.3330$, then through $15.40 \mathrm{~cm}$ of glass of index $1.6360$, and finally through $174.20 \mathrm{~cm}$ of oil of index $1.3870 .$ Find to three significant figures $(a)$ each of the separate optical paths and $(b)$ the total optical path.