A train passes an electric post …
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Naveen Sharma 7 years, 9 months ago
Ans. Let Length of Train = x meter
Time taken to cover post = 10 sec
if a train pass post. it mean it is covering distance equal to its length
So speed = distancetime=x10 ....(1)
Again if it pass a bridge it cover distance equal to sum of length of bridge and length of train.
Length of Bridge = 2 Km = 2000 m
So distance covered = ( 2000 + x ) m
Time taken = 110 sec
So Speed = 2000+x110 ...........(2)
From (1) and (2), we get
=>x10=2000+x110
=> 110 x = 20000 + 10 x
=> 100x = 20000
=> x = 20000100=200 m/s
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