Two litre of water at initial temperature of 270C is heated by a heater of power 1 kW. If the lid of kettle is opened, then heat is lost at the constant rate of 160 J/s. Find the time required to raise the temperature of water to 770C with the lid open (Specific heat of watern4.2 kJ/kg)?

• A. 5 min 40 sec
• B. 14 min 20 sec
• C. 8 min 20 sec
• D. 16 min 10 sec