Answer:
10:50 p.m.
Explanation:
The EMT must report at 2250.
This notation is of a 24 hour system. 24 hour clocks run from 0 to 23 hours. There is no distinction for before or after noon.
In a 12 hour clock system the clock runs from 12 to 11. The distinction between day and night is done by denoting time before noon as ante meridian (a.m.) and after noon as post meridian (p.m.)
So, 2250 will be 22:50 - 12:00 = 10:50 p.m.