Shortcuts to solve Problems on Trains

 

Problems on Trains are quite common as questions from this topic come every year in various competitive exams like Banking, SSC, CSAT, etc.

The basic concepts of Time, Speed and Distance are used in solving Problems on Trains. So let us first go through some basic formulas of Time, Speed and Distance:

 

Learn Formulas and Shortcuts for Time, Speed and Distance

Read the units of Time, Speed and Distance carefully. If the distance is given in km/hr and the speed is in m/sec then always convert the units.


RULES RELATING TO PROBLEM ON TRAINS

Below are some set of rules to solve questions relating to Trains, irrespective of the types of train & shape of track:

•    Length of the Train

The lengths of the two trains are always added.

•    Distance covered by the Train when crossing a Bridge or Platform

The distance travelled by the train to clear a platform or a bridge is equal to the sum of the lengths of the train and the platform or the bridge.

•    Opposite Direction

Running in opposite direction, time taken by two trains of length  km and  km and speeds  km/hr and  km/hr respectively to cross each other is given by,

•    Same Direction

Running in same direction, time taken by two trains of length  km and  km and speeds  km/hr and  km/hr respectively to cross each other is given by,

•    Crossing Time and Speed

Crossing Speed: If two trains X and Y starting from A and B and run towards each other and take a and b hours to reach B and A respectively after crossing each other then,

SOLVED EXAMPLE

Let us understand the Problems on Trains with an example:

Example: Two train travel in same direction, one at 30 km/hr and the other at 102 km/hr. A man sitting in the slower train passes the faster train in 6 secs. What is the length of the faster train?

Solution:         Since the trains are running in same direction,

                      The length of the faster train

                    

If you found these shortcuts on ‘Problems on Trains’ useful, then do visit www.jagranjosh.com for more such videos on Quantitative Aptitude.

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