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:
67 comments Page 4 of 7.
Kumaresan.P said:
1 decade ago
Hi friends please help me,
How to identify relative speed and average speed and normal train problems?
How to identify relative speed and average speed and normal train problems?
Gaurav said:
9 years ago
Relative speed is 120 +80 =200.
Now l =s*t =200*5/18*9=500,
Now, the total dist minus 500-270=230m.
Now l =s*t =200*5/18*9=500,
Now, the total dist minus 500-270=230m.
Moni said:
1 decade ago
Relative speed should be minus from each train speed because the direction is opposite, isn't it so?
Jagadheesh said:
1 decade ago
How to find that this problem is need to convert km/hr to m/s or m/s to km/hr. Please explain?
Krishna said:
1 decade ago
The speed & time of the other so we can directly get the length of the other train.
Janani said:
1 decade ago
I want to know one thing usually where we use or apply this relative speed concept ?
Kd kannan said:
1 decade ago
To aswin:
100/3 and 120 (5/18).
Two values are equal.
It is another form of 33.3.
100/3 and 120 (5/18).
Two values are equal.
It is another form of 33.3.
Ronit said:
1 decade ago
Easy way.
270 + x
---------------- = 9.
33.33+22.22
x = 499.5 - 270.
x = 229.5.
270 + x
---------------- = 9.
33.33+22.22
x = 499.5 - 270.
x = 229.5.
Krishna said:
1 decade ago
Thanks Indiabix, because of this discussion section I can understand that tricks.
Sarang said:
8 years ago
Distance =speed *time,
D=120+80km/h*9,
D=200*5/18*9,
D=1000/2,
D=500-270=230m.
D=120+80km/h*9,
D=200*5/18*9,
D=1000/2,
D=500-270=230m.
(1)
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