Your name is Grace and you're about to turn 20 years old. Oh joy! To celebrate, you are going to go roller-skating with your friends at 7 o'clock. But would you look at the time!! It's 5 o'clock already. You'd better pick up your boyfriend and high-tail it to the roller rink! Don't want to be late to your own party!! But what's the fastest way to get there...?