The human brain consumes about 21.9 W of power under normal conditions, though more power may be required during exams. How long can one Snickers bar (280 cal per bar) power the normally functioning brain?[/B] (Note: The nutritional calorie, 1 Cal, is equivalent to 1000 calories (1000 cal) as defined in physics. In addition, the conversion factor between calories and joules is as follows: 1 Cal = 1000 cal = 1 kcal = 4186 J.) I keep getting the answer 53.52 seconds after I do the conversion and use the formula P = W/t However, 53.52 seconds isnt the correct answer (LON CAPA did not accept it), anyone else have any ideas on this one?