WAEC Geography 2020 Papers

Concept:Each Standard Time Zone spans $15^\circ$ of longitude.Explanation:A country with a longitudinal extent of $155^\circ$ is being considered.To find the number of time zones, divide the total longitude by the width of one time zone.So, number of time zones $= \frac{155^\circ}{15^\circ} = 10.33$.This result is not a whole number.A fractional value means the country extends into a portion of the next time zone.Since even a partial coverage counts as one additional zone, we round $10.33$ upward to $11$.Therefore, such a country would cross or cover $11$ Standard Time Zones in total.Answer:B. $11$