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A train covered a certain distance at a uniform speed. IF the train had been 6km/hr faster, it would have taken 4 hours less. Then the scheduled time and if the train were slower by 6km/hr. The train would have taken 6 hours more than the scheduled time. The length of Journey is
Options:
A .  700km
B .  720km
C .  740km
D .  760km
Answer: Option B

let the distance be x km and uniform speed by y 
A Train Covered A Certain Distance At A Uniform Speed. IF T...
 
=> xy+6x-xy = 4y(y+6) and xy-xy+6x = 6y(y-6) 
=> 4y2 +24y-6x = 0 and 6y2 -36y-6x =0 
=> 2y2 -60y =0 
=> 2y(y-30) = 0 
=> Y=30
x/30 “ x/36 = 4 
=> 6x- 5x =720 
=> X =720km


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