IBPS PO Prelims Model Paper 12

In such types of questions where two trains start towards each other and cross each other to reach their respective destinations, there is a relation between the speed and time of the two trains (trains A and B in this case), i.e.,

Speed of train A

Speed of train B

=√

Time taken by Train B

Time taken by Train A

Thus,Let the speed of Train A = SA and time taken by Train A =5

1

7

h
Speed of Train B = 54 km/h and time taken by Train B =9

1

7

h

SA

54

=√

64 7

36 7

=√

64×7

7×36

=

8

6

SA=

8×54

6

=72‌km∕h