What is the time difference between IST and GMT?

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\frac{1}{2}

hours behind GMT

\frac{1}{2}

hours ahead of GMT

There is no difference

\frac{1}{2}

hours behind GMT

answer is B.

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Detailed Solution

Indian Standard Time is

5 \frac{1}{2}

hours ahead of Greenwich Mean Time (GMT). GMT, which is the 0° longitude through Greenwich in London, is measured at an observatory in Greenwich. This time is taken as the standard time and the times of all other countries are calculated to be ahead or behind this time. Indian Standard Time (IST) refers to the time zone followed in India. The imaginary line passing through Mirzapur in Uttar Pradesh is considered to be the Standard Meridian of India. It is at 82° 30’ E longitude. India has a longitudinal extent of about 15° and there is a difference of one hour with a 15° change in longitude. Despite this, India has a single time zone.

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