If the altitudes of a star at its upper and lower transits are $60^{0}$ 30' and $19^{0}$ 30' respectively,the latitude of the place. is

- 1
  
  $30^{0}$
- 2
  
  $35^{0}$
- 3
  
  $40^{0}$
- 4
  
  $45^{0}$

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