Why do we have a standard time?
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We need a standard meridian for India because of the vast longitudinal extent of the mainland. Thus, there is a time lag of two hours from Gujarat to Arunachal Pradesh.
In India, the longitude of 82.5 degrees East is treated as the standard meridian. So, for the whole country, the local time at this meridian is taken as the standard time and is known as the Indian Standard Time (IST).
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Answer :
1) The local time of places which are on different meridians is bound to different
2) For example, it will be difficult to prepare a time table for trains which cross several longitudes.
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