What is the length of a running train p crossing another running train q? i. these two trains take 18 seconds to cross each other. ii. these trains are running in opposite directions. iii. the length of the train q is 180 metres?
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What is the length of a running train P crossing another running train Q?
I.
These two trains take 18 seconds to cross each other.
II.
These trains are running in opposite directions.
III.
The length of the train Q is 180 metres.
[A].I only[B].II only[C].III only[D].All I, II and III are required[E].Even with I, II and III, the answer cannot be obtained.
Answer: Option E
Explanation:
Let the length of the train P be x metres.
II. These trains are running in opposite directions.
III. Length of the train Q is 180 m.
I. Time taken by P to cross Q =(180 + x)  18 =(180 + x)Relative speedRelative speed
Thus, even with I, II and III, the answer cannot be obtained.
 Correct answer is (E).
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Sumit said: (Dec 17, 2013) Since these two trains are running in opposite direction their relative speed should be (u+v). Therefore I think option D is the correct answer.
Arpit said: (Aug 5, 2014) Why I can not do by this method?
D = 180/10 =10m.
And the distance of p.
D = s*t.
= 10*10= 100m.
J.Karthik said: (May 16, 2015) I can not understand.
J.Karthik said: (May 16, 2015) I cannot understand this method.
How this relative speed? Need more statement answer the question.
Priya said: (Oct 30, 2015) I think D is better answer we can obtain answer with I, II, III option.
Tushar said: (Jun 6, 2016) Yes, option D is the correct answer.
@Bhi said: (Jun 30, 2016) Yes, I think with all the statements option's we can solve the question because total time is 18 sec. And the length of the second train is 180 m. So we can assume the speed of the first train then,
X+180/18 = 10 m/s.
180 is just the half part of total distance.
Correct me if I am taking wrong assumption.
Prabir said: (Aug 3, 2016) If you want to find the length of the train then speed is required.
But here speed is not given so the answer is correct here that is E.
Sanjay said: (Oct 7, 2016) Which is the right answer?
Patel said: (Jul 6, 2017) Relative Velocity i.e. (u+v) is required for his question; which is not given here. So, option 'E' is the correct answer.
D.Jyothsna said: (Jul 27, 2017) Thank you all for explaining it.
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