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WAEC Geography 2017 Papers

Question : 15

Total: 50

The degree of longitude through which the Earth spins within 3hours is

Solution:

Concept:

The Earth completes a full rotation of

360^\circ

24

hours, giving a steady spin rate.

Explanation:

In one hour, the Earth rotates

360^\circ \div 24 = 15^\circ

So the Earth moves through

15^\circ

of longitude every hour.

For a period of

3

hours, multiply the hourly rate by the time:

15^\circ \times 3 = 45^\circ

Thus, in

3

hours the Earth spins through exactly

45^\circ

of longitude.

This value matches option C.

Answer:

45^\circ

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