Thomas arrived at the library at 11:45 AMHe left 1 hour 40 minutes laterAt what time did Thomas leave the library?

At 1:25 P. M.

Step-by-step explanation:

Thomas arrived at the library at 11:45 AM and he left 1 hour 40 minutes later.

So, 1 hour 40 minutes is equivalent to (60 + 40) = 100 minutes.

Now, after 15 minutes, the time will be 12 P. M.

So, remaining (100 - 15) = 85 minutes i. e. 1 hour and 25 minutes the time will be 1:25 P. M.

Therefore, Thomas leaves the library at 1:25 P. M. (Answer)