An assembly line with $40$ operations is to be balanced. the total ammout of time reuired for all of its operations is $59$ minutes. the longest operation takes $1\mathrm{.}9$ minutes and the shortest takes $0\mathrm{.}8$ minutes. the line will operate for $630$ minutes per day. what is the output rate if the timer is set at $1\mathrm{.}9$ minutes? Round the output rate to the closest whole number