Question

solve 4 by middle term spilting

Answer 1

Heya!! ✌️✌️

Here is your answer dear......

Let take speed of the train = x km/h And time taken by train in normal speed  = y hours A train travels a distance of 480 km at a uniform

speed.Distance = speed  × time So we

get x*y = 480                   …..(1).
 
If the speed had been 8 km/h less, then it would have taken 3 hours more to cover the same distance

New speed  = x – 8 km/h

Time taken = y + 3 hours

Use same formula again

Distance = speed × time

or,  (x- 8) × (y + 3)  = 480   

 xy + 3x -8y – 24  = 480

plug xy = 480 we get  480 + 3x – 8y – 24   = 480

  3x – 8y – 24            = 0

Find the value of y here  
 -8y = 24 – 3x

Divide by – 8 we get y = -3 + 3/8x

Plug this value in equation first we get

x(-3 + 3/8x) = 480-3x + 3/8

x2 = 480

Multiply by 8 we get-24 x +  3x2 = 3840

Divide by 3 we get x2 – 8x  = 1280x2 – 8x  - 1280 =0

I HOPE THIS WILL HELP YOU✌️✌️

HAVE A GREAT DAY DEAR.....

^_^