A train takes 25 seconds and 17 seconds respectively to cross two bridges 210m and 122m long. Find the length and speed of the train.
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> (210+x)/25=(122+x)/17 = speed of the train
-> (210+x)*17=(122+x)*25
-> 210*17+17x=122*25+25x
-> (210*17) - (122*25) = 8x
-> x= 65
So the length of the train is 65m
The speed of the train = (210+65)/25 or (122+65)/17 =11m/sec
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