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
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 |
Bird : Fly : : Snake : ? (A) Timid (B) Clatter (C) Crawl (D) Hole
Mr. T has a wrong weighing pan. One arm is lengthier than other. 1 kilogram on left balances 8 melons on right, 1 kilogram on right balances 2 melons on left. If all melons are equal in weight, what is the weight of a single melon?
sir could u send me andhra bank clerical model papers
A person runs 6 ft in 1/4 sec. how much it will run in 10 sec. ans 240
Challenge For you Friends!! 1 Ladke ne 1 Ladki ko Milny k liye ‘HOTEL’ me Bulaya, Ladki nahi aai, Ladka Ladki k Ghar gya, aur Table par Baith kar Machis ki 15 Tiliyon se ‘HOTEL’ Likha. Ladki Samjh gai, Ladki ne 1 Tili Uthai Aur Ladke ko Ans Mil gya. Batao Ladki ne kon c Teli Uthai Aur Ladke ko kya Jawab Mila?
suppose you select in this company after six month you will get big job in mnc. Are you go there?
any body who got interview call letter from axis bank... ganesh here... call me 9842648112 or mail me at ganesh_280574@rediffmail.com
C1,C2 upto Cn are n cities in a country.There are some roads connecting these cities.They are connected in such a that Crth city has r distinct routes connecting each of the other city in the country. 1)if n=27,then how many roads are there in a country? 2)if n=4,in how many distinct routes,can a person travel from c3 to c2?
i want some model question papers in banking sector
what is ment SEBI?
Age of Grandfather is the ages of 4 grandchildren where their ages are in consecutive.Find the age of Grandfather.
in space ship 5men are going1.doctor,drug asdditive 2.lady lawer has done crime 3.teacher emotinally imbalanced 4. 18 year old aeruonautical engineer 5. noble lauraut .suddenly some thing happend and oxygen is available to only three people to use which of three you choose