A train travelling with constant speed crosses a 96 m long platform in 12 sec an

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A train travelling with constant speed crosses a 96 m long platform in 12 sec and another 141 m long platform in 15 sec .The length of the train and its speed are?

A. length=78m
speed=13 m/s
B. length=84m
speed=15 m/s
C. length=94m
speed=17 m/s
D. length=68m
speed=12 m/s

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