1.

A train travels 180 km at a uniform speed. If the speed had been 9 km/hour more, it would have taken 1 hour less for the same journey. Find the speed of the train.

Answer» Correct Answer - 36 km/hr
Let the speed be x km/hr. Then,
`(180)/(x)-(180)/((x+9))=1`
`impliesx^(2)+9x-1620=0impliesx^(2)+45x-36x-1620=0.`


Discussion

No Comment Found