Problem $4(25$ p$/$s$.)$: In the $T-$junction shown below, $60\%$ of the flow on minor road $\text{'}N\text{'}$ tends to make a left turn. Assume the acceptable delay is $5$ seconds and consider the flow rates given in vehicles per hour, as illustrated in the figure below.

A$.$ Calculate the delay in hours caused by this flow.

$10pts$

B$.$ Determine whether it is better to divide the minor road $\text{'}N\text{'}$ into two lanes or to divide the lane for left turns on the major road $($M$2)$ into two lanes

$15pts$