The probability of observing a train in 30 minutes on a track is 665/729. What is the probability of observing a train in 5 minutes ?

Hint : Shoot for an elegant solution.

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The probability of observing a train in 30 minutes on a track is 665/729. What is the probability of observing a train in 5 minutes ?

Hint : Shoot for an elegant solution.

I came across this game called Troyis. Being a theoretician, whenever I come across a new game, the first question that comes to my mind is "What is its complexity ?". Here is the decision version of Troyis :

- TROYIS : Given an instance of Troyis, can you paint all the white cells in <= k clicks ?

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