$|$ Level $|$ Accommodation $|$ GFA $($approx$.)$ per floor $($m$^2)|$ Floor$-$to$-$floor height $($m$)|$

$|------------|---------------|------------------------------|---------------------------|$

$|3/$F $15/$F $|$ Office $|$ ~$1,000|3\mathrm{.}4|$

For the office floors $(315/$F$)$ they are all staff offices. Based on the floor area, estimate the population of the building, and then propose two schemes for the lift system in the building including one single zone group of lifts and one with high $/$ low zone.

The two schemes may have different lift speed and car capacity. Based on your proposal, estimate for the up$-$peak period:

a$.$ The round trip time,

b$.$ The up$-$peak interval,

c$.$ The up$-$peak handling capacity,

d$.$ The percentage of total population served.

for the two schemes.

A comprehensive explanation $($maximum $2$ A$4$ pages$)$ is expected so do not include the calculations in the main content except the summarized figures $($in table format if appropriate$).$The calculations shall be submitted as an attachment but should be concise.