The AGV travels clockwise around the loop as shown in Figure QI to deliver loads from load station to unload station. Loading time is $0\mathrm{.}60$ min and unloading time is $5/6$ of the loading time. The velocity of the loaded vehicle is assumed to be $5/6$ m$/$s and unloaded velocity increases to $3600$ m$/$r while traffic factor and availability are $0\mathrm{.}90$ and $0\mathrm{.}9$S in that order. $0)$ Sketch Figure Q$1($c$)$ and show the movement and direction of AGVs on it$.($it$)$ Determine the number of vehicles needed to satisfy the demand for the layout of $1440$ delivery$/$day$.$