Determine the ETA of your ship (in local time) if you depart from Perth, Australia (ZD 7 East) to Cape Town, South Africa (ZD 1 East) on the 12th of August 2019 @ 0830H local time at a speed of 12.5 knots. Distance between the ports is 4715 nautical miles.

Answer 1

To determine the ETA (Estimated Time of Arrival) of the ship, we need to calculate the sailing time based on the distance and speed, and then add it to the departure time.

First, let's calculate the sailing time:

Distance = 4715 nautical miles
Speed = 12.5 knots

Sailing time = Distance / Speed
Sailing time = 4715 / 12.5
Sailing time ≈ 377.2 hours

Now, let's convert the sailing time into days and hours:

1 day = 24 hours
377.2 hours ≈ 15.7 days

Since the calculated time is in decimals, we round it up to the nearest whole number.

Sailing time = 16 days

Finally, let's add the sailing time to the departure time:

Departure date: 12th August 2019 @ 0830H local time
Sailing time: 16 days

Estimated Arrival date and time = Departure date + Sailing time
Estimated Arrival date and time = 12th August 2019 @ 0830H + 16 days

Now, let's calculate the local time of the arrival in Cape Town, South Africa, by considering the time zone difference:

Perth, Australia (Departure):
Time Zone: ZD 7 East

Cape Town, South Africa (Arrival):
Time Zone: ZD 1 East

So, there is a time difference of 6 hours between the two ports. Cape Town is 6 hours behind Perth.

Therefore, the estimated local time of arrival in Cape Town, South Africa would be:

08:30 AM Perth time + 16 days - 6 hours = 02:30 AM local time in Cape Town, South Africa.