SOLUTION: Kathy and Ken work in a textbook warehouse. Kathy can fill an order of 100 books in 40 min. Ken can fill the same order in 60 min. How long would it take them, working together, to

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Question 205854: Kathy and Ken work in a textbook warehouse. Kathy can fill an order of 100 books in 40 min. Ken can fill the same order in 60 min. How long would it take them, working together, to fill the order?
Answer by Alan3354(69443) About Me  (Show Source):
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Kathy and Ken work in a textbook warehouse. Kathy can fill an order of 100 books in 40 min. Ken can fill the same order in 60 min. How long would it take them, working together, to fill the order?
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Kathy does 1/40 order per minute
Ken does 1/60 order per minute.
Together = 1/40 + 1/60 per minute
= 5/120 per minute
--> 24 minutes per order.
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A shortcut is product/sum
40*60/(40+60) = 2400/100
= 24 minutes