This question was popular with the candidates but the candidates could not correctly distinguish between local time and standard time. The expected answers are:
local time varies from one longitude to another at the rate of 4 minutes per degree of longitude whereas standard time varies from one time zone to another on hourly basis of 15 ° of longitude to 1hour.
standard time maintains the central time for the time zone in which they are, whereas local time varies from place to place within a zone. standard time falls within 24 time zones whereas local time varies irregularly from longitude to longitude within each time zone. standard time is associated with Greenwich Mean Time whereas local time is not.
The candidates performed better in calculating the longitude from the time.