Question

The difference in standard times of verious countries is calculated with reference to __________
IST
GMT
BRT
None of these

Answer 1

Answer:

GMT

Is the answer of your question

Explanation - Greenwich Mean Time is the mean solar time at the Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon; as a consequence, it cannot be used to specify a particular time unless a context is given

Answer 2

Option 2– GMT
The 0 degree longitude passing through Greenwich, near London, is considered as standard and the time of all other time zones are calculated accordingly.