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    calculating elapsed time
    By savithri biju

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    three rules ::

    1) check the minutes. if they are same, the result will have 00 minutes. the hours would be the difference of hours. eg. 6.00 to 7.00 7.45 to 8.45
    if (1) is not true
    2) check further the hours. if they are same, the result will have 0 hours . the minutes would be difference of minutes eg. 6.00 to 6.45 (45-00) 6.15 to 6.55 (55-15)
    if neither (1) nor (2) is true
    3)twin checks check if the hours are next to each other and the minutes in the ending time is 00. If yes,
    elapsed time is 60 - the figure in the minutes column of starting time et. 6.35 to 7.00 (60-35 min)
    If all the above rules answer in negative, then the long method of splitting eg. 4.45 to 8.35
    4.45 to 5.00 (rule 3)
    5.00 to 8.00 (rule 1)
    8.00 to 8.35 (rule 2)



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