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 4 of 9.
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.
Pallavi said:
8 years ago
How 5/18 coming in the problem?
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:
8 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.
Samarya kapoor said:
9 years ago
@All.
Answer is incorrect. It should be 48 instead of 24. If the given answer is correct then look at question number 9 the same question with different value then q. 9 is incorrect.
Answer is incorrect. It should be 48 instead of 24. If the given answer is correct then look at question number 9 the same question with different value then q. 9 is incorrect.
Tejaswini said:
9 years ago
Problem no.9 is same only the length of trains is different. There they have considered the length of both trains. Then why in this problem they have considered the length of one train?
Please tell me the reason.
Please tell me the reason.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers