The guards change over between 10:16 pm and 10:25 pm which means the hallway is clear during that time. How many minutes do you have exactly to cross the yard without being noticed?
Answers
The answer is exactly 8 minutes.
Explanation:
The starting time of change = 10:16 pm
The ending time of change = 10:25 pm
So, the very 1st minute to cross the Hallway without being noticed is after 10:16 pm.
And the very last minute to cross the Hallway without being noticed is before 10:25 pm.
So our available time lies between the interval 10:16 pm & 10:25 pm.
We shall neither include 10:16 pm nor 10:25 pm.
So we have exactly 8 minutes to cross the hallway.
These minutes are 17th, 18th, 19th, 20th, 21st, 22nd, 23rd and 24th minutes that are lying between 16th and 25th minutes.
I have a slightly different take on it. I have two time zones to predict as my answer.
Since guards change at 10.16 pm, we don’t know at what second the change actually takes place. We will take it at 10.16 zero seconds, and 10. 24 59 seconds.
So the total time at hand will be 9 minutes 59 seconds. This is the maximum time.
And the next is the change starts at 10.16 59 seconds and ends at 1025 0 seconds.
Here the time we have is 8 minutes 1 second. This is the minimum time.