Two masons with the same performance would have made of plaster for 6 days. One of them, however, has increased its daily performance by 50%. How long would take they now to make plaster together?

Correct result:

t =  4 d


a=2 6=12 d b=2 6=12 d b1=b50100 b=1250100 12=6 d  t=11/a+1/b1=11/12+1/6=4 d

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