For an electron to have the same de Broglie wavelength as that of a Deuteron, its velocity should be times that of Deuteron   

The mass of hydrogen is 1836 times greater than the mass of electron. The mass of deuteron $\left({\text{D}}_1^2\right)$ is two times than the mass of hydrogen. Therefore, the velocity of electron is 3672 times than the velocity of Deuteron.

De-Broglie wave equation is

$\lambda =\frac{h}{mv}$

For electron,

$\lambda =\frac{h}{m_e{v}_e}\Rightarrow v_e=\frac{h}{\lambda m_e}$  

For Deuteron,

$\lambda =\frac{h}{m_D{v}_D}\Rightarrow v_D=\frac{h}{\lambda m_D}$

As $m_e=\frac{1}{1836\times 2}\text{of\hspace{0.17em}}{m}_D$, then the velocity of electron is 3672 times than the velocity of Deuteron.