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  1.  

    A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct?
    2. A.

    2 p.m. on Tuesday
    B.

    2 p.m. on Wednesday
    C.

    3 p.m. on Thursday
    D.

    1 p.m. on Friday

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    Answer : Option B

    Explanation :

    Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.

     

     The watch gains[2+4\(\frac { 4 } { 5 } \)]min.or \(\frac { 34 } { 5 }\)min. in 170 hrs

     

    Now,\(\frac { 34 } { 5 }\) min are gained in 170 hrs.

     

     2 min. are gained in[170x\(\frac { 5} { 34 }\)x2]hrs=50hrs

     

     Watch is correct 2 days 2 hrs. after 12 p.m. on Monday i.e., it will be correct at 2 p.m. on Wednesday.

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