Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - Data Sufficiency 1 (Q.No. 2)
Directions to Solve
Each of the questions given below consists of a statement and / or a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statement(s) is / are sufficient to answer the given question. Read the both statements and
- Give answer (A) if the data in Statement I alone are sufficient to answer the question, while the data in Statement II alone are not sufficient to answer the question.
- Give answer (B) if the data in Statement II alone are sufficient to answer the question, while the data in Statement I alone are not sufficient to answer the question.
- Give answer (C) if the data either in Statement I or in Statement II alone are sufficient to answer the question.
- Give answer (D) if the data even in both Statements I and II together are not sufficient to answer the question.
- Give answer(E) if the data in both Statements I and II together are necessary to answer the question.
2.
What is the length of a running train crossing another 180 metre long train running in the opposite direction? | |
I. | The relative speed of the two trains was 150 kmph. |
II. | The trains took 9 seconds to cross each other. |
Answer: Option
Explanation:
Let the two trains of length a metres and b metres be moving in opposite directions at u m/s and v m/s.
| Time taken to cross each other = | (a + b) | sec. |
| (u + v) |
| Now, b = 180, u + v = |  |
150 x | 5 |  m/sec |
= | 125 | m/sec. |
| 18 | 3 |
 9 = |
a + 180 |
| (125/3) |
a = (375 - 180) = 195 m.
Discussion:
23 comments Page 1 of 3.
Sanjay said:
1 decade ago
@ADITI.
1 kilo is 1000.
1hour is 60s*60m=3600s.
1000/3600 = 5/18.
If you multiply 5/18 to that value you can convert it in to m/s.
1 kilo is 1000.
1hour is 60s*60m=3600s.
1000/3600 = 5/18.
If you multiply 5/18 to that value you can convert it in to m/s.
(1)
Mukesh said:
9 years ago
Time is taken to cross each other 9 seconds given in the question. So we can put the value in that place in the formula.
Naeem said:
8 years ago
@Dilhara.
u+v relative speed in case of opp. direction.
@Ramshya_Fathima b=180 is given in data. Check it.
u+v relative speed in case of opp. direction.
@Ramshya_Fathima b=180 is given in data. Check it.
Kapil said:
1 decade ago
Relative speed,u+v = 150 km/hr
we multiply it with 5/18 to convert it into m/sec
u+v= 150*(5/18)
we multiply it with 5/18 to convert it into m/sec
u+v= 150*(5/18)
Deepanshu said:
7 years ago
@Sony Sharda.
B is the length of another train which is given in the question=180m.
B is the length of another train which is given in the question=180m.
(2)
Saumya said:
8 years ago
Relative speed means U-V but it is considering u+v.
So, the given answer is wrong.
So, the given answer is wrong.
Ramshya fathima said:
8 years ago
How we take b=180?
I don't understand please explain anyone to know the answer.
I don't understand please explain anyone to know the answer.
Thanushree y r said:
6 years ago
I can't understand the solution of this problem. please anyone tell me in brief.
Nur alom said:
8 years ago
The relative speed for opposite direction is u+v not u-v.
Sunitha said:
6 years ago
@All.
When you multiply 150*5/18 then you will get 125/3.
When you multiply 150*5/18 then you will get 125/3.
(1)
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