year 8 maths

186 Chapter 3 Measurement and Pythagoras’ theorem
GMT and travel
Investigation
As discussed in Section 3J , the world is divided into 24 time zones, which are determined loosely by each
15° meridian of longitude. World time is based on the time at a place called Greenwich near London,
United Kingdom. This time is called Coordinated Universal Time (UTC) or Greenwich Mean Time
(GMT). Places east of Greenwich are ahead in time, and places west of Greenwich are behind.
In Australia, Western Standard Time is 2 hours behind Eastern Standard Time, and Central Standard Time
1
is hour behind Eastern Standard Time. Use the world time zone map on pages 166–7 to answer these
2
questions and to investigate how the time zones affect the time when we travel.
1 East and west
Name five countries that are:
a ahead of GMT b behind GMT
2 Noon in Greenwich
When it is noon in Greenwich, what is the time in these places?
a Sydney b Perth c Darwin d Washington, DC
e Auckland f France g Johannesburg h Japan
3 2 p.m. EST
When it is 2 p.m. Eastern Standard Time (EST) on Wednesday, find the time and day in these places.
a Perth b Adelaide c London d western Canada
e China f United Kingdom g Alaska h South America
4 Adjusting your watch
a Do you adjust your watch forwards or backwards when you are travelling to these places?
i India ii New Zealand
b In what direction should you adjust your watch if you are flying over the Pacific Ocean?
5 Flight travel
a You fly from Perth to Brisbane on a 4 -hour flight that departed at noon. What is the time in
Brisbane when you arrive?
b You fly from Melbourne to Edinburgh on a 22 -hour flight that departed at 6 a.m. What is the time
in Edinburgh when you arrive?
c You fly from Sydney to Los Angeles on a 13 -hour flight that departed at 7:30 p.m. What is the time
in Los Angeles when you arrive?
d Copy and complete the following table.
e
Cambridge Maths NSW
Stage 4 Year 8 Second edition
Departing Arriving Departure time Flight time (hours) Arrival time
Brisbane Broome 7 a.m. 3.5
Melbourne London 1 p.m. 23
Hobart Adelaide 1.5 4 p.m.
London Tokyo 12 11 p.m.
New York Sydney 15 3 a.m.
Beijing Vancouver 3:45 p.m. 7:15 p.m.
Investigate how daylight saving alters the time in some time zones and why. How does this affect
flight travel? Give examples.
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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