estion $3$: For the compound gear train shown below. Gear $1$ is rotating at $300rpm.$ Teeth for the gear $1=65,$ gear $2=26,$ gear $3=75,$ gear $4=25,$ gear $5=50,$ gear $6=20.$ Determine the following:

$($a$)$ Speed ratio of the gear train

$($b$)$ Speed of Gear $6$