Now you plan to make a letter $B$ by yourself. The stages to make a $B$ should be $($in this order$)$ A: Bend a small straight piece to $U$ form, $B$ : Bend another small straight piece to $U$ form, $C$ : Make a strong straight base piece, $D$ : Attach the two smaller $U$ pieces to the base piece to creat a B$.$ Assume the following amount of work in seconds is required at each station: $A$:$28$ secs$,B$ : $32$ secs$,C$:$48$ secs$,$ and $D$ : $57$ secs$.$ Furthermore, assume three class mates come over, and each of you is assigned to exactly one task $(A-D).($Assume you want to make many Bs$,$ i$.$e$.,$ perform the calculations for a continuous process.$)$ what is the capacity of your process $($Bs per hour?$)$