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If $8$ waves with a wavelength of $1\mathrm{.}5m$ pass by a given point in $30$ seconds, what is the wave speed?

A$)5\mathrm{.}6\frac{m}{s}$

B$)2\mathrm{.}5\frac{m}{s}$

C$)0\mathrm{.}18\frac{m}{s}$

D$)1\mathrm{.}5\frac{m}{s}$

E$)0\mathrm{.}40\frac{m}{s}$