A Carnot refrigerator (the reverse of a Carnot engine) absorbs heat from the freezer compartment at a

Question:

A "Carnot" refrigerator (the reverse of a Carnot engine) absorbs heat from the freezer compartment at a temperature of - 17°C and exhausts it into the room at 25°C.
(a) How much work would the refrigerator do to change 0.65 kg of water at 25°C into ice at - 17°C?
(b) If the compressor output is 105 W and runs 25% of the time, how long will this take?