Subject

    Quantitative Aptitude

    Topic

    Triangle

    A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In the afternoon of the same day, when the watch indicated quarter past 4 o'clock, the true time is:

    ক)
    59(7/12) min. past 3
    খ)
    4 p.m.
    গ)
    58(7/11) min. past 3
    ঘ)
    2(3/11) min. past 4

    Explanation

    Time from 7 a.m. to 4.15 p.m. = 9 hrs 15 min. = 37/4 hrs. 3 min. 5 sec. of this clock = 3 min. of the correct clock. => 37/720 hrs of tjis clock = 1/20 hrs of the correct clock. => 37/4 hrs of this clock = (1/20×720/37×37/4) hrs of the correct clock. = 9 hrs of the correct clock. So, the correct time is 9 hrs after 7 a.m. i.e., 4 p.m.

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