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
- 6 Answers
- 36541 Views
- Accenture, OPI Global, TATA, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
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 |
Complete the series 2, 7, 24, 77,__
9 Answers Accenture, BSNL, TCS,
The owner of a hobby store needed to calculate the percentage of customers who purchase wood glue. Upon completing his survey, he noticed that 60% of the people that entered his store purchased an item. Of those customers, 15 percent purchased wood glue. What percent of the people that entered the store purchased wood glue? a) 8% b) 7% c) 9% d) 12% e) 15%
PL CAN ANYONE SENT ME RRB material superdent post questions
Company A owns 40% of the stocks in the XYZ corporation. company B ownz 15000 shares. company C owns all the shares not owned by the companies A or B. How many shares of stock does Company A own if company C has 25% more shares than Company A? a) 450000 b) 50000 c) 750000 d) 60000
A person gives a secret to two other persons in 5 minutes. How long will he take to tell the secret to 768 people?
The cost of four dozen proof machine ribbons and five dozen accouting machine ribbons was Rs.160/-. If one dozen accounting machine ribbons cost Rs.20/-, what is the cost of a dozen proof machine ribbons?
I most like to work with? Most men act though?
If a and b are positive integers and (a-b)/3.5 = 4/7, then the relation between a and b is
the concession stand at cinema city sells popcorn in three sizes-large,super and jumbo one day cinema city 240 bags of popcorn and the ratio of large and super to jumbo was 8:17:5.how many super bags of popcorn were sold on that day
Each side of a rectangle is increased by 100%. What is the increase in % of its area?
tellme 2 mintes importance of media
INDIA HAS SO WITNESSED...........CENSUSES BY 2011. (A) 12 (B) 13 (C) 14 (D)15
English 
