Aptitude - Clock - Discussion

Thanks for explaining the answer.

I think the question is incorrect.

It is like this: A correct clock will have a time gap of (720/11 = 65 and 5/11) minutes between two successive overlaps of the hours hand and the minute hand. IF this time is being covered by the incorrect clock in 64 minutes (64 < 65 5/11), then the incorrect clock is gaining time, not losing time. What should have been covered in 65 5/11 mins is now being covered in 64 mins.

Thus the time gained in 65 5/11 minutes is 1 5/11 minutes (=16/11). So the time gained in 24 hrs (1440 minutes) is (1440 * (16/11) * (11/720) = 32 mins.

I believe when the incorrect clock covers a specified (correct) time in lesser (incorrect) time, then the incorrect clock is gaining time.

The answer must be : clock gains time of 32 mins per day.

I have a small correction to offer to my previous explanation.

In 64 mins of correct time, the watch shows to have covered 65.5/11 mins. So the watch runs faster. Hence the time is gained. In 64 mins the time gained is 1.5/11 min. So in 24 hrs (1440 mins) the time gained is 1440*(16/11)*(1/64) = 32.8/11 mins.

So the time is GAINED, not lost, as per my understanding.

I think the clock is gaining time. Because, instead of meeting after 65 5/11, it is meeting in 64 minutes only. Hence the question, "what time it looses is wrong".

I am not understanding this question. Please, anybody explain me.

Here, I think there will be gain in time. Not a loss in time.

Please explain that 55 min space concept. I am not getting it properly.

I am unable to get the concept of -55 min space covered in 60 min. As well as the question about hands coincide every 64 min refers to?

Please explain me why in last step it is multiplied with 1/64?

The minute hand of a clock overtakes the hour hand at intervals of M minutes of correct time. The clock gains or loses in a day by=(72011/M)(60 * 24M) minutes.