A certain microwave oven delivers 750 watts (J/s) of power to a coffee cup containing 50.0 g water at 25.08°C. If the wavelength of microwaves in the oven is 9.75 cm, how long does it take?
a) 12.30 seconds
b) 15.45 seconds
c) 18.60 seconds
d) 21.75 seconds