A train travels a distance of 480 km at a uniform speed. If the speed had been 8 km/hr less, then it would have taken 3 hours more to cover the same distance. The speed of the train is
Distance travelled by train = 480 km
Let the speed of the train be x kmph.
Time taken for the journey = 480x
Given speed is decreased by 8 kmph
Hence the new speed of train = (x–8) kmph
Time taken for the journey = 480x−8
Either x+32=0 or x−40=0
As, speed cannot be a negative value,
We get, x=40
Thus, the speed of the train is 40 kmph.