A watch, which gains uniformly, was observed to be 4 minutes, slow at 6 a.m. on a Monday. On the subsequent Thursday at 7 p.m. it was noticed that the watch was 6 minutes fast. When did watch show the correct time?

 

  • Option 1)

     

    5 p.m. Tuesday

     

  • Option 2)

     

    4 p.m. Tuesday

     

  • Option 3)

     

    None of these

     

  • Option 4)

     

    3 p.m. Tuesday

     

  • Option 5)

     

    6 p.m. Tuesday

     

Answers (1)

At 6 AM on Monday, the time is shown by the clock = 5: 56

At 7 PM on Thursday, the time shown by the clock = 7:06

Difference between the times in hours = 24 + 24 + 24 + 13 => 85 hours

In 85 Hours clock covered 10 Minutes.

To show the correct time it has to cover 4 Minutes,

Time is taken to gain 4 minutes = 4 x 85/10 => 34 Hours

The exact time when the clock will show correct time = Monday 6 AM + 34 Hours => Tuesday 4 PM

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