Solution:

Together: \( \frac{1}{A} + \frac{1}{B} = \frac{1}{T}\)

Where: A are the number of days A can finish the job alone . B are the number of days B can finish the job alone. T are the number of days A and B can finish the job together.

\( \frac{1}{6} + \frac{1}{4} = \frac{1}{T}\)

\( \frac{5}{12} = \frac{1}{T}\)

\( T = \frac{12}{5} =2.4 \) days