A train covers a distance in $50$ min, if it runs at a speed of $48$ kmph on an average. The speed at which the train must run to reduce the time of journey to $ 40$ min will be .

Using Distance = Speed multiplied by Time, the total distance is 48 kmph multiplied by (50 / 60) hours, which equals 40 km. To cover this 40 km distance in 40 minutes (which is 2/3 of an hour), the required speed is 40 divided by (2/3), resulting in 60 km/h.

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