Boy Meets Girl

A boy and a girl agree to meet in the park. Each will show up at a random time between 12:00 and 13:00, and wait for the other person 20 minutes, but not past 13:00.

What is the probability that they will actually meet?

所有跟帖： 

• 5/9 -twfx- ♂ (0 bytes) () 04/13/2010 postreply 21:02:37

• 5/9 is too small,it seems 5/6. -jinjing- ♀ (0 bytes) () 04/14/2010 postreply 12:22:55

• it seems u r wrong again -guest007- ♀ (0 bytes) () 04/14/2010 postreply 18:32:33

• 13/18,right?some one is not waied 20 mts.not good. -jinjing- ♀ (10 bytes) () 04/14/2010 postreply 19:55:12

• 回复：Boy Meets Girl -genier7- ♀ (5 bytes) () 04/15/2010 postreply 02:24:30

• 回复：回复：Boy Meets Girl -genier7- ♀ (16 bytes) () 04/15/2010 postreply 02:35:00

• plese show your steps. -jinjing- ♀ (134 bytes) () 04/15/2010 postreply 08:23:59

• 这难道不是 个很直截了当的题目吗？ -twfx- ♂ (680 bytes) () 04/15/2010 postreply 10:43:57

• My friend,the third is less the first,and can't only use linear -jinjing- ♀ (35 bytes) () 04/15/2010 postreply 11:53:26

• 答案：1960/3600 -离离源上草- ♂ (884 bytes) () 10/05/2010 postreply 21:01:56

• 求两个二重积分的比。Twfx is right. 5/9 -皆兄弟也- ♂ (1116 bytes) () 04/15/2010 postreply 21:15:27

• Brother: U& Twfx too smart ,I do it by tipical math. -jinjing- ♀ (253 bytes) () 04/16/2010 postreply 08:12:56

• good! different ways to the same destination. -皆兄弟也- ♂ (0 bytes) () 04/16/2010 postreply 08:28:42

• 这解有点杀鸭用牛刀的味道。 -duck_donald- ♂ (0 bytes) () 04/22/2010 postreply 09:17:23

• 回复：这解有点杀鸭用牛刀的味道。 -duck_donald- ♂ (154 bytes) () 04/22/2010 postreply 09:20:42

• 回复：回复：这解有点杀鸭用牛刀的味道。 -jinjing- ♀ (32 bytes) () 04/23/2010 postreply 17:51:46

• boy 帅不帅? 把girl 吓跑? -aznxjesus- ♂ (0 bytes) () 05/14/2010 postreply 21:44:25