Question

What is three hours after 11:45

Answer 1

One hour after is 12:45. Two hours after is 1:45. Three hours after is 2:45. Hope this helps! ;)

Answer 2

$Question:$ What is $three$ hours after $11:45$

$Answer:$ $2:45$ (army time ⇒ $14:45$ )

It would be the same thing if you're doing both $ante$ $meridiem$  (a.m.) and $post$ $meridiem$ (p.m.) 

$good\\luck\\on\\your\\assignment$