711  WorkRate
Together, how long? 1

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If Ann does a job in 7 days, and Bob does it in 9 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 8 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 6 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 5 days, and Bob does it in 2 days, how long do they take together? (Nearest to the 10th...)



If Ann does a job in 10 days, and Bob does it in 2 days, how long do they take together? (Nearest to the 10th...)



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



If Ann does a job in 5 days, and Bob does it in 7 days, how long do they take together? (Nearest to the 10th...)



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



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



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711    3.9 2.7 2.7 4.5 1.4 ( 15.2 )   1.7 3.8 2.9 3.2 1.5 ( 13.1 )   [[ 28.3 ]]