Machining Time calculation of Broaching

Q. The cutting length of the broach for the key way cutting in a $150mm$ long cast iron gear hub. given the width of the key way is $9mm$ depth of key way is $4.5mm$ of finishing teeth $=4$ and no.of semi finishing teeth $=8$

Rise per tooth	Pitch
Roughing teeth	$0.1mm$	$22mm$
Semi finishing teeth	$0.0125mm$	$20mm$
Finishing teeth	$0$	$20mm$

1. $968mm$
2. $160mm$
3. $1208mm$
4. None of these