Question

A dog starts chasing a train of length (2x + 120) m which is running at the speed of 12 m/s. Dog reaches the middle of the train, and then turns back and continues running till he reaches the back end of the train. In this process, if the dog travels a distance of 648 m with speed of 18 m/s, then what is the length of the train?

A 420 m
B 240 m
C 480 m
D 300 m
E 360 m
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