PLEASE HELP SOLVE!!

A speed$-$reducer gearbox containing a compound reverted gear train transmits $45$ horsepower with an input speed of $1200re\frac{v}{m}in.$ Spur gears with $20$ pressure angle is used, with $16$ teeth on each of the small gears and $48$ teeth on each of the larger gears. A diametral pitch of $10$ teeth$/$in is proposed.

$($a$)$ Determine the speeds of the intermediate and output shafts.

$($b$)$ Determine the pitch line velocities $($in $f\frac{t}{m}in)$ for each set of gears.

$($c$)$ Determine the magnitudes of the tangential$,$ radial, and total forces transmitted between each set of gears.

$($d$)$ Determine the input torque.

$($e$)$ Determine the output torque, neglecting frictional losses.