AICE Thinking Skills

A system of lifts takes people from the ground-floor of a sky-scraper to the top-floor restaurant. They can carry a maximum of six people. A lift leaves the ground floor once a minute on the minute (Le., one leaves at 12:00 exactly and then at 12:01 exactly and so forth) and takes one minute to get to the restaurant. The following table shows when the diners arrived at the lifts. Time Number 12:00- 12:01 12:01-12:02 12:02 - 12:03 12:03-12:04 m 12:04 -12:05 12:05-12:06 12:06 -12:07 12:07 -12:08 Given that this represents the entire group of people eating at the restaurant when did the last diner leave the ground floor in the lift