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Jerry leaves Melbourne (Australia) for Durban ([tex]$31^{\circ} E$[/tex]) at 22:10 (Wednesday). The time in Durban when he leaves Melbourne is 14:34 (same day). The duration of the flight is 12 hours and 55 minutes.

(a) At what time and on which day will he arrive in Durban?
(b) What will be the time and date in Melbourne when he arrives in Durban?
(c) Calculate the longitude for Melbourne.

2. Draw a contour map to represent a mountain saddle.

3. In a scale of [tex]$1:120000$[/tex], how many centimeters on a map represent 3 km on the ground?

4. Express as cm-per-km scale: [tex]$1:60000$[/tex].

Answer :

Sure, let's break down the solution step by step:

### (a) Arrival Time in Durban

1. Departure Time in Durban's Local Time:
- When Jerry leaves Melbourne, the time in Durban is 14:34 (2:34 PM) on Wednesday.

2. Flight Duration:
- The flight duration is 12 hours and 55 minutes.

3. Calculate Arrival Time:
- Start from 14:34 and add 12 hours and 55 minutes to find the arrival time in Durban.

Adding the hours and minutes:
- Start with 14:34, add 12 hours to get 26:34.
- Convert 26:34 into regular time by subtracting 24 hours from the hours part: 26:34 becomes 02:34.

- Adding the minutes: 34 + 55 equals 89 minutes. Since there's more than 60 minutes, convert it:
- This means 1 hour and 29 minutes.
- Add the extra hour to the current hour: 02:34 becomes 03:34.
- After adjusting with the extra minutes, we get 03:29.

Arrival Time in Durban: 03:29 AM on the next day, which is Thursday.

### (b) Arrival Time in Melbourne

1. Calculate Time Offset from Durban to Melbourne:
- The time difference between Durban and Melbourne is 9 hours and 36 minutes ahead.

2. Calculate Arrival Time in Melbourne:
- The calculated arrival time in Durban is 03:29 on Thursday. To find out what time it is in Melbourne, add the time difference to this.

3. Add the Time Offset:
- Start from 03:29 and add 9 hours and 36 minutes.
- Add the hours: 03 + 9 = 12 hours.
- Add the minutes: 29 + 36 = 65 minutes.

- 65 minutes is 1 hour and 5 minutes.

- Combine these adjustments to get 13:05 (1:05 PM).

Day Calculation:
- Since the time conversion does not shift the day back to Wednesday due to the large offset, it remains Thursday.

Arrival Time in Melbourne: 13:05 (1:05 PM) on Thursday.

### (c) Calculate the Longitude for Melbourne

1. Understanding the Problem:
- Durban is at [tex]\(31^{\circ}\)[/tex] East. We consider the time difference between Durban and Melbourne.

2. Calculate Time Difference:
- If Durban is 9 hours and 36 minutes (which is 9.6 hours) ahead, calculate longitude difference knowing every 1-hour difference equals 15 degrees of longitude.

3. Compute Melbourne’s Longitude:
- Longitude difference: [tex]\(9.6 \times 15 = 144\)[/tex] degrees.
- Since Durban is east and Melbourne’s local time is ahead, Melbourne should be 144 degrees East.

Melbourne’s Longitude: Approximately [tex]\(144^{\circ}\)[/tex] East.

This breakdown should help understand how the calculations were derived without requiring additional code or complex formulas.

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