Please help me with this problem. I\'m not getting a possible answerwith the met

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Please help me with this problem. I'm not getting a possible answerwith the method someone else posted. If anyone could explain how tosolve it, I'd rank them life saver. Thanks.
To keep his barn warm on cold days, a farmer stores 840 kg ofsolar-heated water (Lf = 3.35 x 10^5 J/kg) in barrels. For how manyhours would a 2.0-kW electric space heater have to operate toprovide the same amount of heat as the water does when it coolsfrom 10.0 to 0.0 degrees Celsius and completely freezes?
To keep his barn warm on cold days, a farmer stores 840 kg ofsolar-heated water (Lf = 3.35 x 10^5 J/kg) in barrels. For how manyhours would a 2.0-kW electric space heater have to operate toprovide the same amount of heat as the water does when it coolsfrom 10.0 to 0.0 degrees Celsius and completely freezes?

Explanation / Answer

Using the value given for the specific heat c of watergiven in Table 12.2, we find that the energy released by the wateris

The 2.0-kW heater provides 2.0 x 103 J/s,so that the time is :

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