Question

plz answer me this question​

Answer 1

Answer:

wait...

Step-by-step explanation:

let the speed of train = x km/h

according to time formula

time=distance/speed

= 360/x. ...........(i)

when speed of train increased by 5 km/h

speed = x+5 km/h

time= distance/speed

= 360/x+5. ..........(ii)

from equation i & ii and according to question

360/x - 360/x+5 =1

(360x+1800-360x) /(x^2+5x)=1

x^2+5x-1800=0

x^2+45x+40x-1800=0

x(x+45)-40(x+45)

(x-40) (x+45)

x=40

or x=-45

but spped can't be negative

so speed = x= 40 km/h