One grocery clerk can stock a shelf in 60 min, whereas a second clerk requires 40 min to stock the same shelf. How long would it take to stock the shelf if the two clerks worked together?
A) 24 min
B) 100 min
C) 12 min
D) 30 min
E) 34 min

Question

Quizplus · Accepted Answer

The first clerk stocks 1/60 of the shelf per minute, and the second clerk stocks 1/40 of the shelf per minute. Together, they stock 1/60 + 1/40 = 1/24 of the shelf per minute. Therefore, it would take them 24 minutes to stock the shelf together.

One Grocery Clerk Can Stock a Shelf in 60 Min