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WAEC Geography 2016 Papers

Question : 18

Total: 50

Solution:

Concept:

The Earth rotates

15^\circ

per hour, so longitude difference causes time difference.

Places west of Greenwich are behind GMT.

Explanation:

Sao Luis is at

45^\circ\text{ W}

and London is at

0^\circ

The longitude difference is

45^\circ - 0^\circ = 45^\circ

Time difference

= \frac{45^\circ}{15^\circ} = 3

hours.

Because Sao Luis lies to the west of London, its local time is earlier than London time.

Subtract 3 hours from noon:

12:00\text{ pm} - 3\text{ hours} = 9:00\text{ am}

Answer:

9:00\text{ am}

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