AFCAT Model Paper 10

Calculation:
Let the length of each train be L.
When a train crosses a pole completely, it traverses a distance equal to its own length.
According to the question
Velocity of first train =

L

5

Velocity of second train =

L

6

Whenever a train crosses another train,
Each train travels a distance equal to the sum of their lengths at relative speed.
⇒ Distance to be traveled =L+L=2L
Since they are travelling in the same direction, we have
⇒ Relative speed =

L

5

–

L

6

=

L

30

∴ Time taken to cross each other =

2L

( L 30 )

=60 sec