An express train covers a distance in 50 min, if it runs at a speed of 48 km/h on an average. The speed at which the express train must run to reduce the time of journey to 40 min will be.

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An express train covers a distance in 50 min, if it runs at a speed of 48 km/h on an average. The speed at which the express train must run to reduce the time of journey to 40 min will be.