Really what you need to know is how many feet are in 30 meters.
First you need to know how many feet are in 1 meter. You can look that up or memorize it. That number is aprox 3.2808ft.
we need to get rid of the m unit so we need that on the top left and bottom right
--------- x ----------------
meters cancel and we can multiply to get 98.424ft in 30m
rounding this to the nearest tenth we get 98.4ft/s