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An immersion heater used to boil water for a single cup of tea plugs into a 120V outlet and is rated at 300W. What is the resistance of the heater?

An immersion heater used to boil water for a single cup of tea plugs into a 120V outlet and is rated at 300W.
What is the resistance of the heater?
Suppose your super0sive, super-insulated tea mug contains 400g of water at a temp of 18 degrees Celsius.  How long will this heater take to bring the water to a boil?  Ignore the energy needed to raise the temperature of the mug and the heater itself.

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