The trees were planted at 20 ft intervals.
Tornadoes are violent whirlwinds which vary in their width from a few yards to 1300 feet.
Three feet make one yard.
The snow is two feet in depth.
My estimate of the length of the room was 10 feet.
This fire hose is about sixty feet long.
The room is 15 feet in length and 10 feet in breadth.
The airliner flew at an altitude of 20000ft.