International Time Zones 1

Years

Year 11

Working with Time

International Time Zones

International Time Zones 1

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Question 1 of 5

1. Question
Find the time difference between Paris and Adelaide given the following time zones:

Paris $(+1)$

Adelaide $(+9 1/2)$
- 1. $8 1/2$ hours
- 2. $1$ hour
- 3. $10 1/2$ hours
- 4. $9$ hours
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Standard time zones divide the Earth in $15°$ regions which means each zone has a $1$ -hour difference

The Prime Meridian’s time zone is $0$

Finding the Time Difference

$-1$ time zone $=1$ hour of time difference to the west (West = lest)

$+1$ time zone $=1$ hour of time difference to the east (East = beast)

First, draw a rectangle with the Prime Meridian and the two time zones

Since both time zones are positive, draw the line for the Prime Meridian first

The prime meridian is also called Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC)

Draw a line that connects the two time zones

This line represents a minus sign, which means we must get the difference between the two time zones

We find the difference because both cities are on one side of $UTC$

$9 1/2-1$ $=$ $8 1/2$ hours

Hence, the time difference between Paris and Adelaide is $8 1/2$ hours

$8 1/2$ hours
Question 2 of 5

2. Question
Find the time difference between Toronto and Singapore given the following time zones:

Toronto $(-5)$

Singapore $(+8)$
- (13) hour(s)
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Standard time zones divide the Earth in $15°$ regions which means each zone has a $1$ -hour difference

The Prime Meridian’s time zone is $0$

Finding the Time Difference

$-1$ time zone $=1$ hour of time difference to the west (West = lest)

$+1$ time zone $=1$ hour of time difference to the east (East = beast)

First, draw a rectangle with the Prime Meridian and the two time zones

Since the time zones have different signs, the Prime Meridian should be drawn in the middle

The prime meridian is also called Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC)

Draw a line that connects the two time zones

This represents a plus sign, which means we must get the sum of the two time zones

We find the sum because both cities are on either side of $UTC$

Make sure to add them as both positive numbers

$5+8$ $=$ $13$ hours

Hence, the time difference between Toronto and Singapore is $13$ hours

$13$ hours
Question 3 of 5

3. Question
Find the time difference between Washington, D.C. and Dallas given the following time zones:

Washington, D.C. $(-5)$

Dallas $(-6)$
- (1) hour
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Standard time zones divide the Earth in $15°$ regions which means each zone has a $1$ -hour difference

The Prime Meridian’s time zone is $0$

Finding the Time Difference

$-1$ time zone $=1$ hour of time difference to the west (West = lest)

$+1$ time zone $=1$ hour of time difference to the east (East = beast)

First, draw a rectangle with the Prime Meridian and the two time zones

Since the time zones are both negative, the Prime Meridian should be drawn last

The prime meridian is also called Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC)

Draw a line that connects the two time zones

This line represents a minus sign, which means we must get the difference between the two time zones

We find the difference because both cities are on one side of $UTC$

$-5-(-6)$ $=$ $1$ hour

Hence, the time difference between Washington D.C. and Dallas is $1$ hour

$1$ hour
Question 4 of 5

4. Question
Find the time difference between New York and Abu Dhabi given the following time zones:

New York $(-5)$

Abu Dhabi $(+4)$
- (9) hour(s)
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Standard time zones divide the Earth in $15°$ regions which means each zone has a $1$ -hour difference

The Prime Meridian’s time zone is $0$

Finding the Time Difference

$-1$ time zone $=1$ hour of time difference to the west (West = lest)

$+1$ time zone $=1$ hour of time difference to the east (East = beast)

First, draw a rectangle with the Prime Meridian and the two time zones

Since the time zones have different signs, the Prime Meridian should be drawn in the middle

The prime meridian is also called Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC)

Draw a line that connects the two time zones

This represents a plus sign, which means we must get the sum of the two time zones

We find the sum because both cities are on either side of $UTC$

Make sure to add them as both positive numbers

$5+4$ $=$ $9$ hours

Hence, the time difference between New York and Abu Dhabi is $9$ hours

$9$ hours
Question 5 of 5

5. Question
Find the local time in Paris given the following:

Paris $(+1)$

Washington, D.C. $(-5) 9$ pm Thursday
- 1. $05:00$ pm Thursday
- 2. $03:00$ am Friday
- 3. $10:00$ pm Wednesday
- 4. $03:30$ pm Thursday
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Standard time zones divide the Earth in $15°$ regions which means each zone has a $1$ -hour difference

The Prime Meridian’s time zone is $0$

Finding the Time Difference

$-1$ time zone $=1$ hour of time difference to the west (West = lest)

$+1$ time zone $=1$ hour of time difference to the east (East = beast)

First, draw a rectangle with the Prime Meridian and the two time zones

Since the time zones have different signs, the Prime Meridian should be drawn in the middle

The prime meridian is also called Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC)

Draw a line that connects the two time zones

This represents a plus sign, which means we must get the sum of the two time zones

We find the sum because both cities are on either side of $UTC$

Make sure to add them as both positive numbers

$1+5$ $=$ $6$ hours

Since Paris is to the east of Washington D.C., add $6$ hours to $9$ pm

$9$ pm $+6$ hours

$=$ $21:00+6$ hours Convert $9$ pm to military time by adding $12$

$=$ $21°+6°$ press the DMS button on the calculator for every $°$

$=$ $27°$

Since the answer is greater than $24$ , it means the time we are looking for occurs the day after which is Friday

Simply subtract $24$ hours to get a proper time format

$27°-24°$

$=$ $3°$

$=$ $03:00$ am

The time in Paris is $03:00$ am Friday

$03:00$ am Friday

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Quiz summary

Information

1. Question

Hint

Great Work!

Finding the Time Difference

2. Question

Hint

Correct!

Finding the Time Difference

3. Question

Hint

Keep Going!

Finding the Time Difference

4. Question

Hint

Fantastic!

Finding the Time Difference

5. Question

Hint

Excellent!

Finding the Time Difference

Quizzes

	$9$ pm $+6$ hours
$=$	$21:00+6$ hours	Convert $9$ pm to military time by adding $12$
$=$	$21°+6°$	press the DMS button on the calculator for every $°$
$=$	$27°$

		$27°-24°$
	$=$	$3°$
	$=$	$03:00$ am