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In 4 ​hours, an experienced cook prepares enough pies to supply a local​ restaurant's daily order. Another cook prepares the same number of pies in 7 hours. Together with a third​ cook, they prepare the pies in 2 hours. Find how long it takes the third cook to prepare the pies alone.

Feb 13, 2020

#1
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Let the rate of the 3rd cook =R

1/7 + 1/4 + 1/R = 1/2, solve for R

R =9 1/3 hours - working alone.

Feb 13, 2020

#1
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