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algol [13]
3 years ago
11

jonathan can type a 20 pages document in 40 minutes, susan can type it in 30 minutes. Jack can type it in 24 minutes. Working to

gether,how much time will it take them to type same document?
Mathematics
1 answer:
yarga [219]3 years ago
5 0
Jonathan's rate = 20/40 = 1/2 page per minute
Susan's rate = 20/30 = 2/3 page per minute
Jack's rate = 20/24 = 5/6 page per minute

Combined rate for the three = 1/2 + 2/3 + 5/6 = 2 pages per minute

Therefore, working together, the will type the document in 20/2 = 10 minutes.

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