Two litres of water kept in a container at `27^(@)C` is heated with a coil of 1 kW. The lid of the container is open and energy dissipates at the rate of 160 J/s. If the specific heat of water is 4.2 kJ/kg, then time taken by coil to raise the temperature of water from `27^(@)C` to `77^(@)C` is

Options

A. 840 S
B. 500 S
C. 420 S
D. 372

Answer

b