Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 11)
11.
A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?
Answer: Option
Explanation:
Relative speed = (120 + 80) km/hr
| = |  |
200 x | 5 |  m/sec |
| 18 |
| = | |
500 | m/sec. |
| 9 |
Let the length of the other train be x metres.
| Then, | x + 270 | = | 500 |
| 9 | 9 |
x + 270 = 500
x = 230.
Discussion:
66 comments Page 4 of 7.
Prasad said:
1 decade ago
How this 5/18 came? Can you solve this ?
Manish said:
1 decade ago
Why there you take x+270/9?
Silambuiks said:
1 decade ago
@Prasath.
5/18 means.
1 km = 1000 meter and 1hr = 3600 second.
Convert Kilometer per hour into Meter per second.
Divide the value of 1000/3600 its answer is 5/18.
5/18 means.
1 km = 1000 meter and 1hr = 3600 second.
Convert Kilometer per hour into Meter per second.
Divide the value of 1000/3600 its answer is 5/18.
Karn sharma said:
1 decade ago
Trains are move in opposite direction. But out of speed n distance one quantity is subtract but in the solution of this question both are added. Please explain I can't understand.
Priya said:
1 decade ago
Opposite direction: Adding.
Same Direction: Subtract.
Same Direction: Subtract.
(1)
Anurag said:
10 years ago
D = S*T = 270+x = 500/9*9.
So x = 500-270 = 230.
So x = 500-270 = 230.
Swathi said:
9 years ago
Thanks alot. It is very helpful to me.
Arun said:
9 years ago
When we add the relative speed when substract please tell me?
Hannan said:
9 years ago
It's simple and just take it easy.
When two trains running on the same site then relative speed is add, running in opposite site then we subtract it.
When two trains running on the same site then relative speed is add, running in opposite site then we subtract it.
Krishna said:
9 years ago
Thanks Indiabix, because of this discussion section I can understand that tricks.
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