In $\triangle ABC$, $\angle B$ is a right angle and the length of $\o…

Question

Prompt

△ A B C

∠ B

is a right angle and the length of

\overline{B C}

is 260 millimeters. If

cos A = \frac{3}{5}

, what is the length, in millimeters, of

\overline{A B}