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12. A train 120 metres long passes an electric pole in 12
seconds and another train of same length traveling in
opposite direction in 8 seconds. The speed of the second
train is
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Answer / mayur
from the first part of question we can comfortably say that
the speed of first train is 10m/s(120m/12sec)..
from the second part
since the two trains are moving in opposite directions
speed of train a=10m/s
speed of train b=x m/s(just consider the magnitude)
since train a crosses b in 8 secs.that means end point of a
crosses the end point of b after 8 secs.
we ASSUME B TO BE AT REST
and a moves toward b with speed =(10+x)m/sec <relative>
therefore distance to be covered =240m
time=8secs
(10+x)=240/8;
x= 20m/sec
| Is This Answer Correct ? | 140 Yes | 45 No |
Answer / hari prasath
The train which is 120 metres in length crosses a pole in 12 seconds implies it is covering the distance 120 metres in 12 seconds.
So speed of this train is 120/12 = 10 m/s.
It is crossing another train traveling in opposite direction in 8 seconds.
Let the speed of this train be y.
It’s length is also 120 metres.
So (120+120)/(10+y) = 8.
Or 10+y = 30.
Or y = 20 m/s or 20*18/5 km/hr = 72 km/hr
| Is This Answer Correct ? | 78 Yes | 4 No |
Answer / shohil sethia
The question hasn't asked about crossing of trains ,That part is not required ,its just given for confusing.
you just have to concentrate on the second part.
That is time taken to cross the pole by the second train and length which is equal of both train.
therefore answer is,
speed=120/8
i.e 15 m/s.
| Is This Answer Correct ? | 5 Yes | 11 No |
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