I travel to work by route A or route B. The probability that I choose route A is 1/4. The probability that I am late for work if I go via route A is 2/3 and the corresponding probability if I go via route
B is 1/3.
(a) What is the probability that I am late for work on Monday?
(b) Given that I am late for work, what is the probability that I went via route B?
i CANT do part b) the answer is 3/5 how??