Sharon lives in Riverdale, near the train station. She has two boyfriends, Wayne in Yonkers and Kevin in midtown Manhattan. To visit Wayne, she takes a train from the northbound platform: to visit Kevin she takes a train from the southbound platform. Since Sharon likes both boys equally well, she simply gets on the first train that comes along. In this way she lets chance determine whether she goes to Yonkers or Grand Central Sharon reaches the station at a random moment every Saturday afternoon. The northbound and southbound trains arrive at the station equally often every 10 minutes. Yet, for some reason. she finds herself spending most of her time with Wayne in Yonkers. In fact, on average. she goes there 9 times out of 10. Can you explain why the odds are so heavily in Wayne's favor?