Question 241669
they each do a FRACTION of the job, based on their individual times ___ the fractions add to 1 (the WHOLE job)


let x=combined time


x/4 + x/6 + x/2 = 1


multiplying by 12 (LCD) ___ 3x + 2x + 6x = 12


11x = 12 ___ x = 12/11