Answers

2015-01-26T18:20:26+05:30
Speed =distance/time
                                                                       time taken=>  124/4 = 31sec
72 = (length of tunnel + length of train)/31
72 = (525 + length of train)/31
72×31 = (525 + length of train)
72×31 = (525 + length of train)
2232-525 = length of train
length of train = 1707 m
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