求解一道高中概率题小A与小B约好早晨在咖啡店见面.两人到达咖啡店的时间均为10am-11am.
且每人最多只等对方20分钟，求两人成功碰面的概率是多少？
记得好像用面积法做，具体忘了。。
If the density function is fa(t) and fb(t) where 10<=t<=11
then the answer is a double integral on fa and fb
\int\int|ta-tb|<1/3 {f(ta)*f(tb)} dta dtb
use two step integral to do it
\int\int|ta-tb|<1/3 {f(ta)*f(tb)} dta dtb
use two step integral to do it
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