if V is the velocity of a wave, it'd wave length and T it'd period, the V, d and T are related by the expression?

Answer 1

To answer your question, velocity, wave length and period are related by the expression:

v = λ x (1/T)

This follows from the equation v = λ x f. Period and frequency are inversely proportional (f = 1/T).

Answer 2

d = V * T.
d = wavelength.
T = 1/F.