What is the SI unit of speed?

Speed is defined as the distance covered per unit of time.

$\therefore$The SI unit of speed = $\frac{\mathrm{SI} \mathrm{unit} \mathrm{of} \mathrm{Distance}}{\mathrm{SI} \mathrm{unit} \mathrm{of} \mathrm{Time}}$=$\frac{\mathrm{m}}{\mathrm{s}}$

Therefore, the SI unit of speed is m/s.