With standard meridian as $82^{0}$ 30' E the standard time at longitude $90^{0}$ E is 8 h 30 m.The local mean time at the place will be

- 1
  
  7h 30m
- 2
  
  8h 00m
- 3
  
  8h 30m
- 4
  
  9h 00m

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