LCAO

The MO of the ground state of a heteronuclear diatomic molecule AB is $\psi_{mol} = C_{A} \phi^{A} + C_{B} \phi^{B}.$ If a bonding electron spends $75.0$ % of its time in an orbital $\phi^{A}$ on atom A and $25.0$ % of its time in $\phi^{B}$ on atom B, what are the values of $C_{A}$ and $C_{B}$ ?

Neglect the overlap of the two orbitals.