An express train covered a certain distance at a uniform speed. If the express train had been 6 km/hr faster, it would have taken 4 hour less than the scheduled time. And, if the express train were slower by 6 km/hr, the express train would have taken 6 hr more than the scheduled time. The length of the journey is:

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An express train covered a certain distance at a uniform speed. If the express train had been 6 km/hr faster, it would have taken 4 hour less than the scheduled time. And, if the express train were slower by 6 km/hr, the express train would have taken 6 hr more than the scheduled time. The length of the journey is: