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Mathematics 11 Online
OpenStudy (anonymous):

A deck of 320 punched cards can be read by one reader in 20 minutes. A second reader can read the same deck in 12 minutes. How many minutes would it take both readers working together to read a deck? How long would it take to process the deck of cards in example one if the first reader stopped working after 5 minutes?

OpenStudy (anonymous):

For the first part i got 7.5 minuets. But for the second I couldn't figure out anything

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