Question 451512
    One grocery clerk can stock a shelf in 45 min. A second clerk requires 25 min to stock the same shelf. How long would it take to stock the shelf if the two clerks worked together?
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Let x = time (minutes) it takes for both
then
x(1/45 + 1/25) = 1
x(25 + 45) = 1125
x(70) = 1125
x = 16.1 minutes