Solve.
-Three gift wrappers can wrap a box full of gifts in 20 minutes, 30 minutes, and 90 minutes, respectively. How long will it take them to wrap the box full of gifts if they work together? (Round to the nearest minute, if
Necessary.)
A) 47 minutes
B) 140 minutes
C) 14 minutes
D) 11 minutes

Question

Quizplus · Accepted Answer

To find the time it takes for all three to work together, calculate their combined rate. The first wrapper's rate is 1/20 boxes per minute, the second's is 1/30, and the third's is 1/90. Adding these rates gives a combined rate of 1/20 + 1/30 + 1/90 = 1/11 boxes per minute. Therefore, it takes them 11 minutes to wrap one box together.

Solve. -Three Gift Wrappers Can Wrap a Box Full of Gifts