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A train covered a certain distance at a ...

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

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The correct Answer is:
Length of the journey is 720 km.
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