Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 7)
7.
Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is:
Answer: Option
Explanation:
Let the length of each train be x metres.
Then, distance covered = 2x metres.
Relative speed = (46 - 36) km/hr
| = |  |
10 x | 5 |  m/sec |
| 18 |
| = | |
25 | m/sec |
| 9 |
 |
2x | = | 25 |
| 36 | 9 |
2x = 100
x = 50.
Discussion:
235 comments Page 3 of 24.
Khushnood Ali said:
3 years ago
Speed = distance/time.
Speed = 2x/36 (2x assumed as distance covered by train and 36secs time is given).
The relative speed = 25/9 (calcuated in solution)
From both equation relative speed and speed should be same that's why;
2x/36 = 25/9.
Speed = 2x/36 (2x assumed as distance covered by train and 36secs time is given).
The relative speed = 25/9 (calcuated in solution)
From both equation relative speed and speed should be same that's why;
2x/36 = 25/9.
(3)
Joy khwaka said:
3 years ago
I know most of us are not understanding how 2x/36 comes,
Here is my explanation;
Here 2x is the distance, then 36 is time in seconds.
Here is my explanation;
Here 2x is the distance, then 36 is time in seconds.
(5)
Chandini said:
3 years ago
Why we take 2x/36=25/9?
Can anyone please explain?
Can anyone please explain?
(9)
Samreen Sultana said:
3 years ago
= [10*5/18]*36.
= 100.
= √100 = 50.
= 50 is the answer.
= 100.
= √100 = 50.
= 50 is the answer.
(9)
Roshan Kunwor said:
4 years ago
Because, when the faster train just crosses the slower, they should cover 2x distance since the length of the train is same.
(4)
Abhishek said:
4 years ago
Why you have done, 2x/36 = 25/9?
And why not 2x/46 = 25/9?
Please explain me clearly.
And why not 2x/46 = 25/9?
Please explain me clearly.
(8)
Shri.. said:
4 years ago
@Bushra Ahmed.
2x=25/9*36 = 900/9 = 100.
2x=25/9*36 = 900/9 = 100.
(2)
Yuva kumar said:
4 years ago
How 2x/36 = 25/9? Please explain me.
(1)
Judah said:
5 years ago
The train should be 100mtr. The solution converts both speeds of the 2 trains to m/s and multiply each m/s by 36 and get the difference of the speed at 36 sec, and that the answer.
Hope it will helps.
Hope it will helps.
(3)
Basavaraj said:
5 years ago
Answer is 100mtr.
As per the relative speed concept and as per the given question both trains of equal length are at the same point so a faster train has crossed its own length or the length of another one to cross it completely.
So it has to travel x mtr to cross another one with a speed of 10km/hour more.
As per the relative speed concept and as per the given question both trains of equal length are at the same point so a faster train has crossed its own length or the length of another one to cross it completely.
So it has to travel x mtr to cross another one with a speed of 10km/hour more.
(6)
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