An observer standing on the deck of a ship just sees the top of a lighthouse. The top of the lighthouse is $40 \mathrm{~m}$ above the sea level and the height of the observer's eye is $5 \mathrm{~m}$ above the sea level. The distance (in $\mathrm{km}$. up to one decimal place) of the observer from the lighthouse
is

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An observer standing on the deck of a ship just sees the top of a lighthouse. The top of the lighthouse is $40 \mathrm{~m}$ above the sea level and the height of the observer's eye is $5 \mathrm{~m}$ above the sea level. The distance (in $\mathrm{km}$. up to one decimal place) of the observer from the lighthouse
is