Aptitude - Problems on Trains - Discussion

EASIEST WAY
(10*5/18)*36=100/2=50

Relative speed 46-36= 10 kmph
10 x 5/ 18 = 25/9
in 36 second total distance covered = 100m
100/2= 50 m length of each train.

We are supposed to find length of each train .
But both train are moving in same direction.
So let the length of each train be x respectively.
So the distace covered will be x+x=2x metres

For all those who got doubt why 46-36?
Its because both train are moving in same direction.
So as per the formula when moving in same direction.it should be subtracted.
When moving in opposite direction,it should be added.

Since the Trains are moving in the same direction The diff between their speeds has to be calculated.
46 kmph - 36 kmph = 10 kmph

convert into meters per second 10 x 1000 meters / 3600 seconds
We get 25/9.

Now apply formula distance = speed x time = 25/9 x 36
Cancelling 36 with 9 we get 4 multiply with 25 we get 100 meters, which is the length of two trains.
As per the question the two trains length is the same there fore each train length is 50 meters.

I can't get,please tell me, Why did we get 46-36? why didn't we get (46+36)

and why did we get 2x/36?

Please explain me.

How can we conclude that distance covered is 2x because here both the trains are moving and hence along with covering the distance 2x, they will cover some more distance. Please make this thing clear.

In the above problem it is given that the lengths of two trains are equal.

according to theory if both trains are moving in same directions then the lenghts will be subtracted but this is the case that both lenghts are different but in the above problem the lenghts are equal in this case we have to add lengths without regarding their directions so lenght is 2x

but as the trains are moving in same directions their relative speeds must be subtracted

so (46-36)*5/18
2x/(50/18)=36
2x=36*(50/18)
x=50m

I think answer is 100 because if we calculate x as 100m then the.

Another train length will be same because both are equal.

Hai how this 36 came? I didn't get it can you please explain clearly? why 2x? why 36 not 46?