Two particles are separated at a horizontal distance X as shown in Figure. They are projected at the same line as shown in figure with different initial speeds. The time after which the horizontal distance between them becomes zero :

• A

  $\frac{\mathrm{x}}{\mathrm{u}}$

• B

  $\frac{\mathrm{u}}{2\mathrm{x}}$

• C

  $\frac{2\mathrm{x}}{\mathrm{x}}$

• D

  none of these