An algebra problem by Siddhant Kishore
Everyday a train starts from Moscow at 12 Midnight. It takes exactly 12 days to reach its destination Vladivostok. A train also starts in the opposite direction at 12 Midnight everyday (from Vladivostok). A man sits in the train at Moscow. How many trains will he encounter in his journey ? (Add the trains he would look at exactly the beginning and ending of the journey)
The answer is 25.
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