A building has two elevators that both go above and below the ground. At a certain time of day, the travel time it takes elevator A to reach height h in meters is 0.8h+16 seconds. The travel time it takes elevator B to reach height h in meters is -0.8h+12 seconds. What is the height of each elevator at this time?
How long would it take each elevator to reach ground level at this time?
If the two elevators travel toward one another, at what height do they pass each other? How long would it take?
If you are on an underground parking level 14 meters below ground, which elevator would reach you first?

the correct answer is a.

since in the sentence the word beacon is used as "guide".

lighthouse:

high tower located on the coasts and ports that emits a powerful light at intervals to guide navigators at night.

luminous tower.

beacon synonyms as a guide: lighthouse, north, tower

karen blumenthal is the author of steve jobs: the man who thought different, and because of her work, she was a finalist in the 2013 yalsa award for excellence in nonfiction award.

it is significant that blumenthal interviewed several people who knew steve jobs personally because this allowed her to gain access to the industry. she has also stated that due to her work in the 1980s, she was able to get acquainted with the process of making computers and other technology, and was able to witness the progress different companies made and to appreciate apple's contribution to it. finally, this close connection with the industry means that her information is more credible than that of a complete outsider.