Understanding Time Zones: India vs. Other Locations

This question involves understanding time zones and how they relate to Coordinated Universal Time (UTC). Different countries and regions operate on specific time zones, which are defined by their offset from UTC.

India Standard Time (IST)

India observes a single time zone, known as India Standard Time (IST). IST is calculated as UTC+5:30. This means India is 5 hours and 30 minutes ahead of UTC.

Calculating Time Differences

To find the time in another location, we compare its UTC offset to India's UTC offset (UTC+5:30).

Time Zone Comparison Table

Determining the Time in London

We are given that it is 7:30 P.M. in India. Let's calculate the time in London. Assuming London is on Greenwich Mean Time (GMT), which is UTC+0:00:

• India Time: 7:30 P.M. (which is 19:30 in 24-hour format)
• India UTC Offset: UTC+5:30
• London UTC Offset: UTC+0:00
• Time Difference: India is 5 hours and 30 minutes ahead of London (UTC+5:30 - UTC+0:00 = 5:30).
• Calculation: To find London time, subtract the difference from India time.
• $19:30$ (India Time) - $5$ hours $30$ minutes = $14:00$

14:00 in 24-hour format is 2:00 P.M.

Therefore, when it is 7:30 P.M. in India, it is 2:00 P.M. on the same day in London (assuming GMT).

Checking Other Options

• Japan (UTC+9:00): 19:30 IST + 3h 30m = 23:00 (11:00 P.M.)
• Dhaka (UTC+6:00): 19:30 IST + 0h 30m = 20:00 (8:00 P.M.)
• Karachi (UTC+5:00): 19:30 IST - 0h 30m = 19:00 (7:00 P.M.)

Only London matches the condition of being 2 P.M. on the same day.