You are taking a photo of a poster on the wall of your dorm room, so you can't back away any farther than $3\mathrm{.}0$ m to take the shot. The poster is $0\mathrm{.}80$ m wide and $1\mathrm{.}2$ m tall, and you want the image to fit in the $15-$mm $\backslash$times $22-$mm frame of the film in your camera. What is the longest focal length lens that will work?