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 ?
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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
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