Calculate the value of Kp for the equation C(s) + CO2(g) <--> 2CO(g)

Calculate the value of Kp for the equation C(s) + CO2(g) <–> 2CO(g)

Given that at a certain temperature

a. C(s) + 2H2O(g) <–> CO2(g) + 2H2(g) Kp1 = 3.97
b. H2(g) + CO2(g) <–> H20(g) + CO(g) Kp2 = 0.623