9/11 ended at 10:45
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The amount of time from 9:45 to 11:00 is 1 hour and 15 minutes.
11 times 9 gives you 99
A number is a multiple of 99 if it's a multiple of 9 and 11 at the same time 99 = 3² x 11
The time from 10 AM to 9 PM is 11 hours. You can calculate this by counting the hours from 10 AM to 9 PM, which includes 11 full hours.
Every country had the 9/11 at the same time, but only the USA suffered the terrorist attack on that day that killed more than 3,000 of its civilian citizens.