1. 2 minutes
2. 4 minutes
3. 6 minutes
4 . 10 minutes

6 minutes

Explanation:

if it's only one resister that's 1 x 6 which is 6. then if there's 3 people in front of you and each take 2 minutes that's 3 x 2 which is 6.

the transfer for conduction is the heat transfering from the liquid to the spoon

the transfer for convection is the heat rising from the liquid to the air

the transfer for radiation is the heat going through the sides of the cup and to the air

at least that is what i would do