Waves propagate along a stretched string at a speed of $8\mathrm{.}0$ m$/$s$.$ The end of the string vibrates up and down once every $1\mathrm{.}5$ s$.$ What is the wavelength of the waves traveling along the string?

O $3\mathrm{.}0$ m

$12$ m

$6\mathrm{.}0$ m

O $5\mathrm{.}3$ m

$4\mathrm{.}0$ m