A train passes by a stationary man standing in platform in 7 seconds and passes by the platform completely in 28 seconds. if the lenght of platform is 330 metres, what is the lenght of the train
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Firstly, to calculate the speed of train.
Distance covered =
length of platform + length of train
=> 330 + x. (taken length of train - x)
Speed = distance/time = (330 + x)/28.
Now. The train covers a man in 7 seconds.
In this case, total length = x
Speed of train = x/7.
Now... We have two equations for speed.
So, x/7 = (330 +x) / 28
=> x = (330 +x)/4
=> 4x = 300 +x
=> x =300/3
=> x = 100m/s
Hence, speed of train is 100m/s.
Distance covered =
length of platform + length of train
=> 330 + x. (taken length of train - x)
Speed = distance/time = (330 + x)/28.
Now. The train covers a man in 7 seconds.
In this case, total length = x
Speed of train = x/7.
Now... We have two equations for speed.
So, x/7 = (330 +x) / 28
=> x = (330 +x)/4
=> 4x = 300 +x
=> x =300/3
=> x = 100m/s
Hence, speed of train is 100m/s.
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