Panel house

The construction company has two groups of workers. Group A has more members than B. Panel house was insulated by group A in 10 days. The same block of flats was insulated together in 6 days. How many days would group B block insulate?

Correct result:

b =  15

Solution:

$6 \cdot \ (1/10 + 1/b)=1 \ \\ \ \\ 6 \cdot \ (b/10 + 1)=b \ \\ \ \\ 4b=60 \ \\ \ \\ b=15$

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