WAEC 2019 Geography · Question 18

How many standard time zones will a country with a longitudinal extent of 150° have?

Options

A.10
B.11
C.15
D.16

Answer: A. 10

Explanation written with AI and checked against the answer key

Analyze the question: We need the number of standard time zones for a country that stretches across 150° of longitude. Concept: The Earth rotates 360° in 24 hours, so it moves 15° of longitude every 1 hour. Each standard time zone is therefore 15° wide. Solution: Number of time zones = longitudinal extent ÷ width of one zone = 150° ÷ 15° = 10 time zones Check against the options: 10 is option A. Options C (15) and D (16) would come from dividing wrongly or confusing degrees with hours. Option B (11) would only apply if the extent covered partial zones at both ends, but the standard textbook method is a straight division. Answer: A, 10 time zones. Tip: Remember "15 degrees = 1 hour = 1 time zone". For any time-zone question, divide the longitude span by 15. Also, 1° of longitude equals 4 minutes of time, which is useful for calculating time differences between places.

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