Given: Figure $1,{}_6=60rpm$ CCW$.$

$N_2=10T,N_{3,\text{i}\text{n}\text{n}\text{e}\text{r}}=20T,N_{3,\text{o}\text{u}\text{t}\text{e}\text{r}}=25T,N_4=20T,N_5=10T,N_6=25T.$ Gears $4$ and $5$ are press fit on the same shaft and have the same angular velocity. All gears rotate within fixed bearings. Gear $3$ has inner teeth $($ring gear$)$ and outer teeth $($spur gear$).$

Find: ${}_5$ in rpm$.$ CCW rotations are positive, CW rotations are negative.

$($i$)$ Numeric answer

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Figure $1$