Problems on Trains - Concept 7, Quantitative Aptitude Video Lecture - DI

welcome to this edition of train for
aptitude today we look at the seventh
concept in the problems on trains the
problem given to us is as follows two
trains are moving in opposite directions
at 60 gram meters per hour and 90
kilometers per hour
the lens are 1.1 kilometer and 0.775
kilometer respectively the time taken by
the slower train to cross the faster
train in seconds is our options are 836
seconds be 45 seconds C 48 seconds D 49
seconds from the data that we have we
can visualize the problem as follows two
trains moving in opposite directions
this slower train on the lower track and
the faster train on the upper track our
assumption as always is that the two
trains move at a steady pace throughout
there is Abney note that the trains
overtake each other moving further once
the trains have overtaken each other the
visualization would be as about what we
need to note that either the slower
train overtaking the faster train or the
faster train or taking the slower train
is nothing but the same we now move to
solving the problem the data given to us
is the speeds of the Train 60 and 90
kilometers per hour the length of the 2
train 1.1 kilometer and 0.775 kilometer
what we need to find as the time to
overtake each other we begin with by
calculating the relative speeds of the
train in this case 150 kilometers per
hour or 125 by 3 meters per second the
next step is to calculate the total
distance covered by the Train which is
the length of the two trains 1.1 plus
0.775 which is 1875 meters given this
information the time to cross each other
is nothing but the total distance play
the relative speed of the trains this
gives us 45 seconds to begin
generalizing we begin by looking at what
data we have and putting it into the
table that we have created about the
next step is to find the relative speeds
of the train and keep it in meters per
second next we calculate the total
distance covered by the train that is a
length
rude rains we know the distance covered
we know the relative speed and we use
this to calculate the time that the
trains take to cross each other
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