without stoppage a train travels a certain distance at an avg speed of 60 km/h and with stoppage it travels at 40 km/h. on an avg how many min per hour does the train stop during journey?

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Correct me if wrong:
60- 40 is 20 Km /hr diff.
which is 1/3 of speed without stop.
so time consumed will be 1/3 hour or 20 min.