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Railways Reasoning Calendar Sample Paper Clock and Calendar Sample Test Paper-11

  • question_answer
    How many times are an hour hand and a minute hand of a clock at right angles during their motion from 1.00 p.m. to 10.00 p.m.?

    A)  9                    

    B)  10

    C)  18       

    D)  20

    Correct Answer: C

    Solution :

    [c] In one hour, hour hand minute hand are at right angles 2 times. Times \[=10p.m.1p.m.=9\,hr.\] \[\therefore \] No. of times, when both hands are perpendicular to each other in \[9\,\,hr=9\times 2=18\]


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