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

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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 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.
Class- 10 Session- 2022-23
Mathematics (Standard)
Sample Question Paper
Question no 28 i
Chapter 3 Linear Equations in two Variables.
CBSE
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