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 5 of 9.
Alice said:
10 years ago
This s a good tricky question. I too made a mistake for the first time. But now I got it. Thank you for the explanation.
ASHFAQ said:
1 decade ago
The question ask time taken to pass the driver of the faster train not the full train so we take the distance only 500.
Sarang said:
7 years ago
Distance =speed * time,
500=45+30km/h*time,
500=75*5/18*time,
500=75*.277*time,
500=20.7*time,
Time=500/20.7=24s.
500=45+30km/h*time,
500=75*5/18*time,
500=75*.277*time,
500=20.7*time,
Time=500/20.7=24s.
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.
Ankit said:
10 years ago
The question here is find the time when driver meet not find the time when the train crosses each other.
AMAR said:
10 years ago
In that condition, take total length both train.
i.e 1000/t = (75*5/18).
We get the answer = 48 s.
i.e 1000/t = (75*5/18).
We get the answer = 48 s.
Sahil said:
5 years ago
Can someone explain why they reversed the distance in the final calculation (i.e 125/6 to 6/125)?
(1)
Durgesh said:
1 decade ago
Consider the driver as a pole is best one method to understand this Question. Answer is right.
Muqeet said:
6 years ago
Here it states to cross the driver, not cross the train.
So, please explain in detail.
So, please explain in detail.
(1)
Leaner said:
8 years ago
It should be 1000 distance because, It is clearly mention in question "500m each long".
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