Help with Physics Question?

A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron and neutrino are emitted at right angles and have a momenta of 9.30 x 10^-23 kg m/sec, and 5.40 x10^-23 kg m/sec, respectively. What is the magnitude and direction of the momentum of the second (recoiling) nucleus?