reaction with a strong base will be very fast.

let weak acid be HX

and Strong base NaOH

HX + NaOH = NaX + H20

now this is a neutralisation reaction.

if both acid and base wud hav bin strong then equilibrium constant for reaction wud hav bin same as that of H + OH = H20

but here acid is weak

we know

HX = H⁺ + X^-  .....K_a = 10^-4

H+ + OH- = H20  .......K_w = 10^14

 

so net reaction is

HX + OH- = H2O + X-  ....K = Ka * Kw = 10 ^10