Question

A train covers a distance of 10km in 12 minutes .If it speed is decreased by 5km/hr than find the time taken by the train to cover the same distance ?​

Answer 1

Answer:

Step-by-step explanation:

time= distance/speed

let unusual speed be x

so (300/x)-(300/x+5)=2

300{(x+5)-x}=2(x+5)x

1500=2x(x+5)

x(x+5)=750

(x^2)+5x-750=0

from this equation, we can find the two zeroes for the equation as -30 and 25

as speed can never be negative,

so x=25 kmph