$2\mathrm{.}7$ Peak$-$hour factor: The flow in each $5-$minute interval from $4$:$30$ to $6$PM is given in the table below. Determine when the Peak Hour begins and ends. What is the Peak Hour Factor for the peak hour?

$\backslash$table$[[$Time$,4$:$30-,4$:$35-,4$:$40-,4$:$45-,4$:$50-,4$:$55-$ G