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Data set 5: Distances from New Zealand by sea
Notes:
An Nmile is a nautical mile and is 10% greater than a mile (used to measure distance on land).
Tropical storms January–March.
Ships only make these passages before or after the tropical storm season.
The month of May offers the best weather conditions.
The southern ocean current runs at 2 knots/hour west to east all year.
Ships on passage to Sydney and Brisbane must push against the southern ocean current.
Ships on passage to Tonga, Cook Islands and Tahiti are carried along by the southern ocean current.
Ships on passage to Fiji cross the current and so experience no counter or favourable effect.
1. The distance by sea from New Zealand to Brisbane and back is:
A 2,400 Nmiles
B > 2,400 Nmiles
C < 2,400 Nmile
D Cannot tell
Answer( )
2. How many ship passages from New Zealand to Sydney, Brisbane, Tonga, Cook Island, Tahiti and Fiji took place in
1978?
A 2,550
B 2,250
C 2,450
D 2,400
E Cannot tell
Answer( )
3. In land miles, what is the distance from New Zealand to Tonga?
A 1,400 miles
B 1,440 miles
C 1,500 miles
D 1,540 miles
E Cannot tell
Answer( )
4. If in the month of December half of all the passages that month were to Sydney and the remainder were to Fiji, how many Nmiles would be covered in total?
A 100,000 Nmiles
B 150,000 Nmiles
C 200,000 Nmiles
D 250,000 Nmiles
E Cannot tell
Answer( )
5. How far is it from Sydney to Fiji?
A 3,000 Nmiles
B 2.000 Nmiles
C 800 Nmiles
D Cannot tell
Answer( )
6. Over a 30-day period during the 1978 storm season, 5 days were classed as experiencing storm conditions. What is the ratio of stormy and non-stormy days during this period?
A 1:3
B 1:4
C 1:5
D 1:6
Answer( )
7. What proportion of the total passages for the year 1978 was made in the months June, July, August and September?
A < Half
B > Half
C Exactly half
D Cannot tell
Answer( )
8. Taking account of the distances and the currents, if a ship were to sail to New Zealand to Brisbane return and then New Zealand to Cook Island return at a constant speed, which passage would you expect to be completed the quicker?
A New Zealand–Brisbane return
B Both passages would take the same amount of time
C New Zealand–Cook Island return
D Cannot tell
9. If 12% of all passages made in 1978 were to Cook Island, how many sailings were there to this destination that year?
A 306
B 302
C 298
D 294
Answer( )
10. A ship on passage from New Zealand to Sydney averages 10 Nmiles/hour through the water and 8 Nmiles/hour over the ground. How many hours would the journey take?
A 125 hours
B 120 hours
C 110 hours
D 100 hours
Answer( )
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