990  WorkRate
Together, how long? 2

Name : _________________

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If Ann does a job in 10 days, and Bob does it in 9 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 4 days, and Bob does it in 6 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 3 days, and Bob does it in 4 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 5 days, and Bob does it in 3 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 9 days, and Bob does it in 9 days, how long do they take together? (Nearest to the 10th...)

If Ann does a job in 9 days, and Bob does it in 10 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 6 days, and Bob does it in 10 days, how long do they take together? (Nearest to the 10th...)



어떤일을 영철이 혼자 하면 9일 걸리고, 나혼자 하면 5일 걸리는데, 같이 일하면 며칠이 걸리는가? (소수점 이하 한자리...)



If Ann does a job in 4 days, and Bob does it in 7 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 9 days, and Bob does it in 5 days, how long do they take together? (Nearest to the 10th...)

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