Correct Answer - Option 2 : 10 hours 50 minutes
For every water image based on a clock,
If minutes given are less than 30, then subtract given time from 17:30 hrs.
If minutes given are more than 30, then subtract given time from 17:90 hrs.
Here, the minutes are more than 30, thus subtract given time from 17:90 hrs.
Therefore, 17:90 – 07:40 = 10:50.
Hence, the correct answer is 10 hours 50 minutes.