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Boy Meets Girl

commentate 2010-04-13 18:10:10 ( reads)

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?

跟帖(17)

twfx

2010-04-13 21:02:37

5/9

jinjing

2010-04-14 12:22:55

5/9 is too small,it seems 5/6.

guest007

2010-04-14 18:32:33

it seems u r wrong again

jinjing

2010-04-14 19:55:12

13/18,right?some one is not waied 20 mts.not good.

genier7

2010-04-15 02:24:30

回复：Boy Meets Girl

genier7

2010-04-15 02:35:00

回复：回复：Boy Meets Girl

jinjing

2010-04-15 08:23:59

plese show your steps.

twfx

2010-04-15 10:43:57

这难道不是个很直截了当的题目吗？

jinjing

2010-04-15 11:53:26

My friend,the third is less the first,and can't only use linear

离离源上草

2010-10-05 21:01:56

答案：1960/3600

皆兄弟也

2010-04-15 21:15:27

求两个二重积分的比。Twfx is right. 5/9

jinjing

2010-04-16 08:12:56

Brother: U& Twfx too smart ,I do it by tipical math.

皆兄弟也

2010-04-16 08:28:42

good! different ways to the same destination.

duck_donald

2010-04-22 09:17:23

这解有点杀鸭用牛刀的味道。

duck_donald

2010-04-22 09:20:42

回复：这解有点杀鸭用牛刀的味道。

jinjing

2010-04-23 17:51:46

回复：回复：这解有点杀鸭用牛刀的味道。

aznxjesus

2010-05-14 21:44:25

boy 帅不帅? 把girl 吓跑?