ratedetrmining-step: 3X(g) + 2Y(g) = 4Z(g)

Question

When 2 moles of gas X and 2 moles of gas Y are placed in a 5.0L vessel, the initial rate of the rxn is found to be 0.45 (mol/L x min. What is the rate constant?

P.S: I think k=1.875(L/mol x s) but im not sure.