Answer:
Time taken = 10400 s
Explanation:
Given:
Initial speed of the train, 
Final speed of the train, 
Displacement of the train, 
Using Newton's equation of motion,

Now, using Newton's equation of motion for displacement,

Now, plug in the value of  in the above equation. This gives,
 in the above equation. This gives,

Now, plug in 234000 m for  , 25 m/s for
, 25 m/s for  and 20 m/s for
 and 20 m/s for  . Solve for
. Solve for  .
.

Therefore, the time taken by the train is 10400 s.