153. A household refrigerator that has a power input of 450 watts and a COP of 2.5 is to cool

five large watermelons, 10 kg each, to 8°C. If the watermelons are initially at 20°C, determine

how long it will take for the refrigerator to cool them. The watermelons can be treated as water

whose specific heat is 4.2 kJ/kg-K.

A. 2220 seconds B. 2230 seconds

C. 2240 seconds D. 2250 seconds