For the in$-$line skate assembly example in this chapter, suppose the times for the individual operations are as follows:

Task $1$: $20$ seconds

Task $2$: $10$ seconds

Task $3$: $30$ seconds

Task $4$: $10$ seconds

Task $5$: $30$ seconds

Task $6$: $30$ seconds

Task $7$: $10$ seconds

Task $8$: $20$ seconds

Design a production line to achieve an output rate of $120$ per hour $($CT $<30$ seconds$).$