Maths question, need help urgently!?

Two hours for every 450kg?! I think you're confusing the units. Fix that and you'll have an easier time.

A 450 kg turkey? Did you call the Guinness World Record people? Where do you find an oven large enough for a 990 pound turkey? That's several years of turkey leftovers.

But, at two hours per 450 kg, if the turkey weighs 5.4 kg (at least that's reasonable), at 2 hours per 450 kg it would take 5.4*2/450 = 0.024 hours or 86.4 seconds.

(I think you copied something incorrectly. The problem parameters simply do not make sense.)

It's a ratio.
5.4/450 = 0.012

multiply 2 hours by 0.012

2 x 0.012 = 0.024 hours = 1 minute 26.4 seconds.

However the question sounds wrong. Should it be 450 g?

In which case, convert 450 g to kg and do the same as above:
5.4/0.450 = 12

12 x 2 hours = 24 hours.

For 450 kg, it takes two hours (120 minutes) to deforst
For 1 kg, it takes 120/450 = 12/45 = 4/15 minutes to defrost
For 5.4 kg, it would take (5.4)(4/15) = 1.44 minutes
1 min 26.4 sec

divide turkey weight by 450g then multiply by 2 hours