Answer:
9 hours and 45 mins
Step-by-step explanation:
First, this is in army time. (Just so you know!) Also, it goes to 24 hours.
What you would do is add 45 mins to get to a single hour: so 20:15 + 45 = 21:00, then add 3 to get to 24:00 or 12:00 am, then add 6 more hours to get to 6:00 hours. So the final answer is 9 hours and 45 mins
