A young man lives in the town of Bee near a railway station. He has two friends, one staying at Cee and the other at Dee. To visit the friend in Cee takes a train on the downtown side of the platform to visit the friend living in Dee he takes a train on the uptown side of the platform. Since both friends are equally dear to him,he lets chance determine which friend he'll visit. He reaches the station at a random moment each Sunday afternoon and takes the first train that comes along. Curiously, though both the trains arrive at the station equally often - every 10 minutes, he finds himself spending more time with the friend in Cee. In fact, on an average he goes there 9 times out of ten. Can you think of a reason why this should be so?

The train going to Dee comes one minute later than the Cee train.If the man happens to reach the station during this one minute he'll get the train going to Dee, but if he comes at any time during the next nine minutes he'll end up taking the other train as he comes to the station randomly, the chances are he'll get the Cee train, nine times out of ten.