An educational worksheet illustrating time zones around the world, showing day and night conditions in different cities and comparing clock times.

Let me work through this step by step.

Looking at the clocks in the image:
- Madrid clock: The hour hand points to 12, minute hand points to 12 → 12:00 (midday)
- Beijing clock: The hour hand points to 7, minute hand points to 12 → 7:00
- Mexico City clock: The hour hand points to 5, minute hand points to 12 → 5:00
- Vancouver clock: The hour hand points to 3, minute hand points to 12 → 3:00

Wait, let me look more carefully. The clocks show:
- Madrid: 12 o'clock (both hands at 12)
- Beijing: 7 o'clock (hour hand at 7, minute at 12)
- Mexico City: 5 o'clock (hour hand at 5, minute at 12)
- Vancouver: 3 o'clock (hour hand at 3, minute at 12)

Hmm, but looking at the map description: "In Madrid it's day but in Vancouver it's night." And the map shows "It's dark" over Americas and "It's light" over Europe/Asia/Australia.

If Madrid is at 12:00 (midday), then:
- Beijing being ahead would be later time - 7:00 PM? That doesn't match if it's showing 7 on the clock... unless it's 7 AM which would be behind, not ahead.

Wait, let me reconsider. If Madrid is 12:00 noon, and Beijing is ahead, Beijing should show a later time. Looking at the clock for Beijing - if it shows 7, that could be 7 PM (19:00). But analog clocks don't distinguish AM/PM.

Actually, looking at typical time zones:
- Madrid is UTC+1 (or UTC+2 with DST)
- Beijing is UTC+8
- Mexico City is UTC-6
- Vancouver is UTC-8

If Madrid is 12:00 noon:
- Beijing would be 12 + 7 = 19:00 (7 PM) - so Beijing is 7 hours ahead
- Mexico City would be 12 - 7 = 5:00 AM - so Mexico City is 7 hours behind
- Vancouver would be 12 - 9 = 3:00 AM - so Vancouver is 9 hours behind

So the clocks show:
- Madrid: 12:00
- Beijing: 7:00 (PM, but shown as 7 on analog)
- Mexico City: 5:00 (AM, but shown as 5 on analog)
- Vancouver: 3:00 (AM, but shown as 3 on analog)

Now for the questions:
1. "How many hours ahead is Beijing?" - Beijing is 7 hours ahead of Madrid
2. "How many hours behind is Vancouver?" - Vancouver is 9 hours behind Mexico City

Wait, let me re-read: "Look at Mexico City and Vancouver. How many hours behind is Vancouver?"

Mexico City shows 5:00, Vancouver shows 3:00. So Vancouver is 2 hours behind Mexico City.

But wait, that doesn't match real-world time zones. Let me check again what the clocks actually show.

Looking at the image description more carefully:
- Madrid: 12 o'clock
- Beijing: appears to show 7 o'clock
- Mexico City: appears to show 5 o'clock
- Vancouver: appears to show 3 o'clock

For the first question about Beijing being ahead of Madrid:
- Madrid: 12:00
- Beijing: 7:00
- If Beijing is ahead, it must be 7 PM (19:00)
- Difference: 19 - 12 = 7 hours ahead

For the second question about Vancouver being behind Mexico City:
- Mexico City: 5:00
- Vancouver: 3:00
- Both would be in the same period (both AM or both PM based on context)
- Difference: 5 - 3 = 2 hours behind

So the answers are:
- Beijing is 7 hours ahead
- Vancouver is 2 hours behind