**Problems on trains: formula tricks questions and answers:**Shortcut tricks are very important in competitive exam.Time plays the main role in exams.Most of the Candidates are skip this topic.But Trains problems are very easy once understand the basics topic/concepts Problems on trains.

As my Knowledge Sharing with you now.In This Topic is some important Formulas and tricks are remember this Points.

We Request all the candidates who are visiting on this page please observe examples carefully.

Now we discuss some basic problems ,Formulas, and concepts On trains.

## Problems on trains: formula tricks questions and answers

### Problems on trains Formulas:

*Formula 1:*

*Formula 1:*

*i)km/hr to m/s conversion:*

*a* km/hr =*a* x(5/18 ) m/s.

*ii)m/s to km/hr conversion:*

*a m/s* =*a* x(18/5 ) km/hr .

1)If a Train of length L1 runs with a speed of S1 crosses a telephonic pole/standing person then the time is

T=D/S

T=>L1/S1

2)If a Train of length L1 runs with a speed of S1 crosses a platform/Tunnel of length L2 then the time is

T=D/S

T=>L1+L2/S1

3)If a Train of length L1 runs with a speed of S1 crosses another train of length L2 runs with a speed of S2 then the time is

i)Same Direction=(L1+L2)/(S1-S2)=T

ii)Opposite Direction=(L1+L2)/(S1+S2)=T

4)If a Train of length L1 runs with a speed of S1 crosses Person Who is also Running with speed of S2 Then the time is

i)Same Direction=L1/(S1-S2)=T

ii)Opposite Direction=L1/(S1+S2)=T

5)If a Train of length L1 runs with a speed of S1 Crosses a Person Who is sitting in another Train of length L2 which is also Runs with a speed of S2 Then the Time Taken by the train to crosses Person is

i)Same Direction=L1/(S1-S2)=T

ii)Opposite Direction=L1/(S1+S2)=T

6)If two trains (or bodies) start at the same time from points A and B towards each other and after crossing they take *a* and *b* sec in reaching B and A respectively, then:

(A’s speed) : (B’s speed) = (√b : √a)