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Earth receives 1400 W m ^-2 of solar pow...

Earth receives `1400 W m ^-2` of solar power. If all the solar energy falling on lens of area `0.2m^2` is focussed on to a block of ice of mass 280 g , then what is the time (in min) taken by the ice to melt completely ? `[L_("fusion")=3.3xx105 J kg ^-1]`

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`5.5`
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