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69. A train passes a telegraph post in 8seconds and a 264 m long bridge in 20seconds. What is the length of train ? |
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Answer» Length of the Bridge = 264 m.Time taken to pass the bridge = 20 sec. Time taken to passe the post = 8 sec.Length of the train = X m (Let.)To pass the bridge train need to coverTrain's length + Bridge legnth(X +264).Speed = Distance covered / time takenNow,X/8 = (264 + X)/2020X = 264 *8 + 8X 20X - X = 264 *8 12X = 264 *8X = (264 *8)/12X = 176 m.Speed of the train = 176/8 = 22 m/sec = (22*18)/5 = 79.2 Kmph. |
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