SOLUTION: john can type a 40, page document in 24 minutes, susan can type it in 30 minutes, jack can type it in 24. working together, how much time will it take them to type the same documen

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Question 319118: john can type a 40, page document in 24 minutes, susan can type it in 30 minutes, jack can type it in 24. working together, how much time will it take them to type the same document?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
1/40+1/24+1/30=1/X
(3+5+4)/120=1/X
12/120=1/X
1/10=1/X CROSS MULTIPLY.
X=10 MINUTES ANS.