Mathematics
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. If the initial speed of the train is x km/hr, then representation of this information algebraically is :
x2 − 8x − 1280 = 0
x2 + 8x + 1280 = 0
x2 − 8x + 1280 = 0
x2 + 8x − 1280 = 0
Related Questions
The diagonal of a rectangular field is 60 m more than the shorter side. If the longer side is 30 m more than the shorter side, then the sides are :
60 m, 90 m
80 m, 110 m
90 m, 120 m
110 m, 140 m
Neha’s father is 28 years older than her. The product of their ages (in years) 4 years ago was 245. If present age of Neha is x years, then the algebraic representation of this information in the form of quadratic equation is:
x2 − 20x − 341 = 0
x2 + 20x − 341 = 0
x2 + 20x + 341 = 0
x2 − 20x + 341 = 0