8th Class Mathematics Related to Competitive Exam Question Bank Calendar and Clock

  • question_answer
    A clock is set right at 5 a.m. The clock loses 16 min. in 24 hours. What will be the true time when the clock indicates 10 p.m. on the 4th day?

    A) 11p.m.                        

    B) 10p.m.

    C) 9p.m.                          

    D) 8p.m.

    Correct Answer: A

    Solution :

    Time from 5 a.m. on a day to 10 p.m. on 4th day is 89 hours. Now, 23 hrs. 44 min. of this clock are the same as 24 hours of the correct clock. i.e., \[\frac{356}{15}\] hrs. of this clock = 24 hrs. of correct clock. \[\therefore \] 89 hrs. of this clock \[=\left( \frac{24\times 15}{356}\times 89 \right)\] hrs. of correct clock = 90 hrs of correct clock. So, the correct time is 11 p.m.


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