$*$give an explanation for the short method

Problem $1$: Referring to the Figure, determine the number of revolutions per minute teeth of gear $\backslash ($ F $\backslash )$ by $($a$)$ long and $($b$)$ short method. $($c$)$ What is its direction of rotation gear $\backslash ($ A $\backslash )$ if $\backslash ($ F $\backslash )$ is rotating at clockwise direction as viewed from the right side$/$end$?$ Show direction of rotation of all gears. Is the train a speed reducer or increaser? How much in percent is speed being reduced or