Create a payoff matrix

"An old lady is looking for help crossing the street. As long as at least one person helps her, she will cross successfully (two are okay but no better than one). You and I are the two people in the vicinity who can help; we have to choose simultaneously whether to do so. Each of us will get pleasure worth a 3 from her success (no matter who helps her). But each one who goes to help will bear a cost of 1, this being the value of our time taken up in helping."

B. Explain what the Nash Equilibria of your game is.