Differentiate between large-scale maps and small-scale maps. 2. Jerry leaves Melbourne (Australia) for Durban (31°E) at 22H10 (Wednesday). The time in Durban when he leaves Melbourne is 14H34 (same day). The duration of the flight is 12 hours and 55 minutes. a. At what time and which day will he arrive in Durban? b. What will be the date and time in Melbourne when he arrives in Durban? c. Calculate the longitude for Melbourne. 3. The mean magnetic declination in 2005 was 9°,6 W. The mean annual change is 4 minutes westward. Calculate the magnetic declination in 2010.

• Large-scale maps show a small geographical area with a high level of detail. They have a larger representative fraction (e.g., 1:10,000).
• Small-scale maps show a large geographical area with less detail. They have a smaller representative fraction (e.g., 1:1,000,000).

a) At what time and which day will he arrive in Durban?
Departure time in Durban: 14H34 (Wednesday)
Flight duration: 12 hours 55 minutes

Add the flight duration to the departure time in Durban:

Convert 89 minutes to hours and minutes:

Add this to the hours:

Since a day has 24 hours, subtract 24 hours to find the time on the next day:

The arrival will be on the next day.
The arrival time in Durban is 03H29 (Thursday).

b) What will be the date and time in Melbourne when he arrives in Durban?
Departure time in Melbourne: 22H10 (Wednesday)
Departure time in Durban: 14H34 (Wednesday)

Calculate the time difference between Melbourne and Durban:

To subtract, borrow 1 hour (60 minutes) from 22 hours:

Melbourne is 7 hours 36 minutes ahead of Durban.

Arrival time in Durban: 03H29 (Thursday)
Add the time difference to the arrival time in Durban to find the Melbourne time:

Convert 65 minutes to hours and minutes:

Add this to the hours:

The arrival time in Melbourne is 11H05 (Thursday).

c) Calculate the longitude for Melbourne.
Time difference: 7 hours 36 minutes
We know that $1 \text{ hour} = 15^\circ$ longitude and $4 \text{ minutes} = 1^\circ$ longitude.

Convert the time difference to degrees:

Total longitude difference:

Durban's longitude is $31^\circ \text{E}$. Since Melbourne is ahead in time, it is to the east of Durban.
Longitude of Melbourne:

The longitude for Melbourne is $\boxed{\text{}145^\circ \text{E}}$.

Mean magnetic declination in 2005: $9^\circ 6' \text{ W}$
Mean annual change: $4' \text{ westward}$
Number of years from 2005 to 2010:

Total change in declination:

Since the initial declination is westward and the change is also westward, add the change to the initial declination:

The magnetic declination in 2010 is $\boxed{\text{}9^\circ 26' \text{ W}}$.