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1' = (1/60)°
1" = (1/60)' = (1/3600)°

1) 30°24'20"
= 30° + 24' + 20"
= 30° + (24/60)° + (20/3600)°
= 30° + 0,4° + 0,0056°
= 30,4056°

2) 24°40'16"
= 24° + 40' + 16"
= 24° + (40/60)° + (16/3600)°
= 24° + 0,67° + 0,004
= 24,674°