In $\Delta ABC$,$m\angle B = 90^{\circ}$ and $\overline{BM}$ is an altitude to the hypotenuse $\overline{AC}$. If $AB = 3$ and $AC = 5$,find the length of $BM$.

  • A
    $2.4$
  • B
    $3$
  • C
    $5$
  • D
    $7.1$

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