Manny said: "If it's Sunday today, it will be Sunday again in 7 days...and in 770 days...and in 140 days...and in 35035 days...and in 14000000007 days!" Emma said: "and to add what
Manny said, it would be Tuesday in 2 days...and in 72 days, and in 702 days...and in 779
days...and in 14777002 days!"

Naruto is choosing between two venues that will deliver food to his house. with probability 1/3 he will choose ramen mania (r), and with probability 2/3 he will choose sushi (s). if he chooses r, 15 minutes after making the call, the remaining time it takes the food to arrive is exponentially distributed with average 10 minutes. if he orders s, 10 minutes after making the call, the time it takes the food to arrive is exponentially distributed with an average of 12 minutes. given that he has already waited 25 minutes after calling, and the food has not arrived, what is the probability that he ordered from r? i am really stuck on how to set this up, so if you could be extra clear, that would be super ! in advance