   # A 270 metres long train running at the speed of 120 kmph crosses another..........What is the length of the other train?

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A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train? posted Jan 11, 2016

Relative speed=s=(120+80)=200km/hr=[200*5/18]m/sec=500/9m/sec
Length of 1st train=d1=270m
Let the length of other train=x metres=d2
Total distance=d1+d2=d
s=d/t
t=9sec
Then
(270+x)/9=500/9
x=230m
Ans is 230 metre answer Jan 11, 2016

Relative speed = (120 + 80) km/hr =>200km/hr
=(200)x5/18
=500/9 m/sec
Let the length of the other train be x metres.
Then, (x + 270)/9=500/9
x+270=500
x=230 meter
so length of other train =230 meter answer Jan 31, 2016

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