Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 22)
22.
Two goods train each 500 m long, are running in opposite directions on parallel tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one.
Answer: Option
Explanation:
| Relative speed = | = (45 + 30) km/hr | |||||||
|
||||||||
|
We have to find the time taken by the slower train to pass the DRIVER of the faster train and not the complete train.
So, distance covered = Length of the slower train.
Therefore, Distance covered = 500 m.
 Required time = |
 |
500 x | 6 |  |
= 24 sec. |
| 125 |
Discussion:
81 comments Page 3 of 9.
Pallavi said:
8 years ago
How 5/18 coming in the problem?
Pallavi said:
8 years ago
The answer is simple. We are converting the 'kilo-meters/hour' value into 'meters/second'.
Let me explain about converting km/hr into m/s in detail.
1 km = 1000 meters.
1 hr = 3600 seconds.
1 km/hr = 1000/3600 m/s
= 10/36 m/s
= 5/18 m/s.
Therefore 1 km/hr = 5/18 m/sec.
Let me explain about converting km/hr into m/s in detail.
1 km = 1000 meters.
1 hr = 3600 seconds.
1 km/hr = 1000/3600 m/s
= 10/36 m/s
= 5/18 m/s.
Therefore 1 km/hr = 5/18 m/sec.
Leaner said:
8 years ago
It should be 1000 distance because, It is clearly mention in question "500m each long".
Nitheesh said:
8 years ago
What if they had asked time for a faster train?
Can anyone solve this?
Can anyone solve this?
Pawan yadav said:
8 years ago
Yes, friends.
Because the length of train add in both condition same direction or opposite direction only speed is a minus in the same direction and add opposite direction.
Because the length of train add in both condition same direction or opposite direction only speed is a minus in the same direction and add opposite direction.
Hemanath said:
8 years ago
How to convert into min? Please tell me.
Shyam said:
9 years ago
In the same question, Find the time taken by the faster train to pass the driver of the slower train one so whats the answer?
Neeraj said:
9 years ago
@All.
This is right because of the length of the man, pole etc is negligible, here asked only driver cross.
This is right because of the length of the man, pole etc is negligible, here asked only driver cross.
Shree said:
7 years ago
Thanks for explaining the answer.
Shubham said:
7 years ago
The correct answer is 48 sec.
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