Consider the following code:
NDSolve[(?*P)/(Pi*?*Cp)*Integrate[Exp[-2 ((x - V t)^2 + z^2)/(8 Qt + ?^2)], {t, 0, Infinity},x == 0, ? == 4, ? == 789, Cp== 2440, P == 0.04, Q == 0.0000000883, ? == 0.00035, V == 2, z == 1]
I have used this to solve the equation with the values of constants given here. I am getting an error of "Integrate: Invalid integration variable or limit(s) in x==0". What am I doing wrong here?