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Mathematics, 02.12.2020 06:00 alexbrafford

A bricklayer can build a wall of a certain size in 5 hours. Another bricklayer can do the same job in 4 hours. If the bricklayers work together, how long would it take to do the job? a. 9h
b. 2(2/9)h
c. 20h
d. 4(1/2)h

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