Correct Answer - Option 4 : 60
We know that the clock gains 5 minutes every hour.
Number of hours between 11 am and 11 pm = number of hours between 11 am and 12 noon + number of hours between 12 noon and 11 pm
⇒ 1 + 11
⇒ 12 hours
Therefore, in 12 hours, the clock will gain = 12 × 5 = 60 minutes
Hence, 60 minutes is the correct answer.