The distance covered by a train in ( x + 1) hours is (x3 + 1) km. What is the speed of the train ?

$(x^3 - 1) $ km/h $(x^2 - x +1)$ km/h $(x^2 + x +1)$ km/h $(x + 1)$ km/h

$(x^2 - x +1)$ km/h

Speed = \(\frac{Distance }{Time}\) = \(\frac{(x3 + 1) }{ ( x + 1) }\) = \(\frac{(x+1) ( x2 - x + 1 ) }{ ( x + 1) }\) = ( x2 - x + 1 ) km/h