Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 6)
6.
A train 240 m long passes a pole in 24 seconds. How long will it take to pass a platform 650 m long?
Answer: Option
Explanation:
| Speed = |  |
240 |  m/sec = 10 m/sec. |
| 24 |
 Required time = |
|
240 + 650 | sec = 89 sec. |
| 10 |
Discussion:
202 comments Page 12 of 21.
Sidhartha said:
9 years ago
The given answer is wrong.
Train length + platform length + train length = 240 + 650 + 240 = 1130 = the distance to be covered to cross the platform.
Time taken is 1130/speed (10m/s) = 113 sec.
Train length + platform length + train length = 240 + 650 + 240 = 1130 = the distance to be covered to cross the platform.
Time taken is 1130/speed (10m/s) = 113 sec.
Sidhartha said:
9 years ago
The given answer is wrong.
Train length + platform length + train length = 240 + 650 + 240 = 1130 = the distance to be covered to cross the platform.
Time taken is 1130/speed (10m/s) = 113 sec.
Train length + platform length + train length = 240 + 650 + 240 = 1130 = the distance to be covered to cross the platform.
Time taken is 1130/speed (10m/s) = 113 sec.
Shailesh said:
9 years ago
The given answer is correct.
We can be said the train passes only when the last engine is cross the platform. So the length of platform and length of the train is right.
We can be said the train passes only when the last engine is cross the platform. So the length of platform and length of the train is right.
Yash Mehta said:
9 years ago
Why you didn't add twice the length of the platform?
Mustapha said:
9 years ago
The answer is just about a simple proportion.
Deeksha verma said:
9 years ago
I also think 65 sec is correct. 240 m is the length of the train.
Rohit said:
9 years ago
89 is the correct answer. Because the question is time taken by a train to cross the bridge, here 650m is the length of the bridge and 240m is the length of the train so 650 + 240.
Ayush Jain said:
9 years ago
I think that the and should be 65.
Since we have to take out speed and then to put in another.
Since we have to take out speed and then to put in another.
Leena said:
9 years ago
Why did'nt we multiply the speed by the terms 5/18?
Ie. 240 = (x * 5/18) * 24.
x = 36 so the speed of the train will be 36 m/sec.
Ie. 240 = (x * 5/18) * 24.
x = 36 so the speed of the train will be 36 m/sec.
Rakes said:
9 years ago
I think it's like this that if the train will pass a man means pass its own length.
So velocity, s = 240/24 = 10 m/s.
Let it passes then platform in x sec.
10 = 240 + 650/24 + x.
So, x = 65.
So velocity, s = 240/24 = 10 m/s.
Let it passes then platform in x sec.
10 = 240 + 650/24 + x.
So, x = 65.
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