NAM = 3000 NAM

From table 210 000 kg → 8019 NAM  1023 mins

(8019 – 3000) = 5019 NAM → 640 mins

Sector time 1023 – 640 = 383 mins

Icing/Pack flow/ISA -  no correction

Climb correction +6 mins

Descent correction +11 mins

Sector time = 383 + 6 + 11 = 400 mins