Question 369135
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Hi,
Let x represent the days it takes together
Amount done per day is the Equalizer
1/4 + 1/6 + 1/2 = 1/x 
Mulitplying both sides of the equation by 12x so as all denominators = 1
3x + 2x + 6x = 12
11x = 12
x = 12/11
x = 1.09 hrs