Question

A clock is set to show the correct time at 11 a.m. The clock gains 12 minutes in 12 hours. What will be the true time when the clock indicates 1 p.m. on the 6th day?

Answer 1

If clock gains 12 minutes in 12 hrs

So In 24 hrs the clock will gains 24 minutes..

So in five days it will gain to 120 minutes. (will exclude six day additional minutes as it'sbefore 1 pm)

Will deduct 120 minutes from 1

Will get 11 that is 11 a.m

Answer 2

True time shown in clock at 1st day = 11 a.m.
Time gained in 12 hrs      = 12 minutes
Time gained on 24 hrs     = 24 minutes
Time gained in 5 days     = 24 × 5 minutes = 120 minutes or 2 hrs 
So, after on 6th day true time will be 2 hrs deducted from time showed on
clock
 Time showed on 6th day = 1 p.m.
So, true time = 1 p.m. - 2 hrs = 11 a.m.