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Trains X and Y arrive at a station at random between 8 A.M. and 8.20 A.M. Train
X stops for four minutes and train Y stops for five minutes. Assuming that the trains
arrive independently of each other.

(a) Determine the probability that train X arrives before train Y.

(b) Determine the probability that the trains meet at the station.
(c) Assuming that the trains met, determine the probability that train X arrived before train Y.

Thanks

check the link posted by balaji

if not getting that comment back

Hey, Its fine till triangle , but i am not able to get it onwards.

1. I am not getting why trains meet if they satisfy " x<= y+5 & y<=x+4

2. How can i get that area ?

I tried using area under curve but cant get how to do it

3. How he get area as 72 in 3rd case ?