Why is there a two hour differencebetween gujrat and arunachal pradesh???

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BCUZ B/W AP AND GUJRAT THERE IS A GAP OF APPROX 30LONGITUDES AND WITH INCREMENT OF 10 , THE TIME INCREASES 4 MIN ... SO TO COVER 30 LONGITUDES IT TAKES 30*4 TIME =120 MIN = 2 HOURS
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The longitudinal coordinates of India are - 68 degree 7 minutes East and 97 degree and 25 minutes East. Gujrat is the western most part of the country and Arunachal Pradesh is the eastern most part of the country. There is almost a difference of about 30 longitude.
1 DEGREE IS EQUAL TO 4 MINUTES. Thus to cover 30 longitudes it takes 120 minutes (30 * 4) which is 2 hours. 
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It takes two hours for a person to travel from gujarat to Arunachal pradesh  as there is a gap of 30 0 longitude between them. 
hence, with increment of 10 time is increased by 4 min. 
SO,                                   10  = = = = = = = =  4
                                        300 = = = = = = = =  ? (TIME)
  hence, by unitary method,
                                      TIME = 120 min
        So,                         TIME = 2 hours 
                                                          - - - - - - - - - - - - hence  proved 
therefore, the time taken to travel from gujarat to Arunachal  pradesh or vice versa the time gap is 2 hours.
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