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A train covered a certain distance at a uniform speed. If the train would have been 6 km/h faster, it would have taken 4

A train covered a certain distance at a uniform speed. If the train would have been 6 km/h faster, it would have taken 4 hours less than the scheduled time. And, if the train were slower by 6 km/hr; it would have taken 6 hours more than the scheduled time. Find the length of the journey.

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