year 8 maths

168 Chapter 3 Measurement and Pythagoras’ theorem
Example 22
Using time zones
Coordinated Universal Time (UTC) and is based on the time in Greenwich, United Kingdom. Use the
world time zone map (on pages 166–7) to answer the following.
a When it is 2 p.m. UTC, find the time in these places.
i France
ii China
iii Queensland
iv Alaska
b When it is 9:35 a.m. in New South Wales, Australia, find the time in these places.
i Alice Springs
ii Perth
iii London
iv central Greenland
SOLUTION
EXPLANATION
a i 2 p.m. + 1 hour = 3 p.m. Use the time zone map to see that France is to the east of
Greenwich and is in a zone that is 1 hour ahead.
ii 2 p.m. + 8 hours = 10 p.m. From the time zone map, China is 8 hours ahead of
Greenwich.
iii 2 p.m. + 10 hours = 12 a.m . Queensland uses Eastern Standard Time, which is 10 hours
ahead of Greenwich.
iv 2 p.m. – 9 hours = 5 a.m . Alaska is to the west of Greenwich, in a time zone that is
9 hours behind.
b i 9:35 a.m. – 1 2 hour = 9:05 a.m . Alice Springs uses Central Standard Time, which is 1 2 hour
behind Eastern Standard Time.
ii 9:35 a.m. – 2 hours = 7:35 a.m. Perth uses Western Standard Time, which is 2 hours behind
Eastern Standard Time.
iii 9:35 a.m. – 10 hours = 11:35 p.m .
(the day before)
iv 9:35 a.m. – 13 hours = 8:35 p.m .
(the day before)
UTC (time in Greenwich, United Kingdom) is 10 hours
behind EST.
Central Greenland is 3 hours behind UTC in Greenwich,
so is 13 hours behind EST.
Exercise 3J
REVISION
UNDERSTANDING AND FLUENCY
1–3, 4–6(½), 7, 8–9(½) 3, 4–6(½), 7, 8–10(½) 4–6(½), 7, 8–10(½), 11
1 From options A to F , match up the time units with the most appropriate description.
a single heartbeat A 1 hour
b 40 hours of work
B 1 minute
c duration of a university lecture C 1 day
d bank term deposit
D 1 week
e 200 m run E 1 year
f flight from Australia to the UK F 1 second
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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