Question

25. plz solve it
plzzzzzz

Answer 1

Hey!!!!

Good Afternoon

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let the speed of the train be x km/h

Then we know

=> time = distance/speed

ATQ,

$\frac{480}{x - 8} - \frac{480}{x} = 3$


$= > \frac{1}{x - 8} - \frac{1}{x} = \frac{3}{480}$

$= > \frac{x - (x - 8)}{x(x - 8)} = \frac{1}{160}$

$= > \frac{8}{ {x}^{2} - 8x} = \frac{1}{160}$

Cross Multiplying

$= > 1280 = {x}^{2} - 8x$

=> x² - 8x - 1280 = 0

=> x² - 40x + 32x - 1280 = 0

=> x(x - 40) + 32(x - 40) = 0

=> (x - 40)(x + 32) = 0

Thus x = 40 km/h

Thus the speed of the train is 40 km/h

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Hope this helps ✌️

For doubts comment below

Answer 2

let the speed =x
let the time =t
x=v/t , t=v/s
x=480/t , t=480/x