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Basic Maths, probability, a brain teaser. suppose you are standing at 1/3 the length of a bridge and you hear a train coming from backwards. You have just enough time to run back and get off the bridge before the train hits you. You also have just enough time if you decide to run forwards. What is the relative speed between you and the train.
The brain teaser was probably the hardest question (to do mentally). Despite that, I managed to get the right answer that the train will have to have twice the speed that I have. But I could not really explain my resoning very clearly and did a mistake in one of the mental maths questions they asked me previously. The interviewer was very quiet. After asking the questions it felt almost like they hung up the phone.
Why twice? Image you run 1/3 forward, at this time, train should have just reached the bridge behind you since if you run backward for the same distance you will just meet the train. After you run 1/3 forward, train is following you from behind, then train and you will meet at the other end together, which means at the same time train runs three times the distance of you.
i got train is 3 times of your speed
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