A train overtakes two persons - who are walking in the same direction in which the train is going - at the rate of 2 kmph and 4 kmph - and passes them completely in 9 and 10 seconds respectively. The length of the train (in metres) is :(l) 72

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A train overtakes two persons - who are walking in the same direction in which the train is going - at the rate of 2 kmph and 4 kmph - and passes them completely in 9 and 10 seconds respectively. The length of the train (in metres) is :(l) 72