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Saleem types (20/40) = 1/2 page per minute.

Aysha types (20/30) = 2/3 page per minute.

Raheel types (20/24) = 5/6 page per minute.

Working together ... IF they can split up the paper appropriately and avoid any duplication ... they can type

(1/2) + (2/3) + (5/6)

= (3/6) + (4/6) + (5/6)

= (12/6) = 2 pages per minute.

At 2 pages per minute, they will require (20/2) = 10 minutes to type the same document.

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