ECZ 2019 · GCE Paper 1 — Earth Geometry
The points A(60°N, 30°W) and B(30°S, 30°W) lie on the same meridian. It takes a plane 6 hours to fly from A to B. What is its speed in knots?
- A. 540 knots
- B. 900 knots
- C. 150 knots
- D. 5 400 knots
Verified working — step 1
A and B share the meridian 30°W, and the angular distance between them is 60° + 30° = 90° of latitude. Since 1° of arc = 60 nautical miles, the distance is 90 × 60 = 5 400 nm. Speed = 5 400 ÷ 6 = …The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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