Conservation of Momentum Homework Help

[HighDef]

Gerald and Ashley stand face to face on some ice. They push off against each other and move apart from each other in opposite directions. Gerald moves with a velocity of 3m/s and Ashley moves with a velocity of 5m/s. If Gerald has a mass of 110 kg, what is Ashley's mass?

 

[Stonebridge]

Can you show your attempt at this question and what formula(s) you think you will need.