The distance covered by a train in ( x + 1) hours is (x3 + 1) km. What is the speed of the train ?
Answer & explanation
Correct answer: option 2
Speed = \(\frac{Distance }{Time}\)
= \(\frac{(x3 + 1) }{ ( x + 1) }\)
= \(\frac{(x+1) ( x2 - x + 1 ) }{ ( x + 1) }\)
= ( x2 - x + 1 ) km/h