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 7 of 21.
Sai said:
8 years ago
Since the train has to cross the platform, it is not on the platform. It has to completely cross the platform means it crosses it's length.
Therefore total distance becomes train's length+ platform's length =890m.
Time = 890/10 = 89sec.
Therefore total distance becomes train's length+ platform's length =890m.
Time = 890/10 = 89sec.
SREERAM said:
8 years ago
Pole is given to just calculate the speed of the train, In the question, nowhere mention pole is on the platform so the answer is 65 m/s.
Saketh said:
8 years ago
Yes, you are right @Kumar.
Mir Rokon uddin. said:
8 years ago
To me, answer is 41 if the pole and the platform consider separately.
650-240=410.
Now it crosses 240m in 24s.
So, 410m in 41s.
If both pole and platform consider jointly the answer will be 89s. I understood 2nd case. But my Mind also with the 1st case. I think the question is ambiguous. Or am I wrong?
650-240=410.
Now it crosses 240m in 24s.
So, 410m in 41s.
If both pole and platform consider jointly the answer will be 89s. I understood 2nd case. But my Mind also with the 1st case. I think the question is ambiguous. Or am I wrong?
Aravind said:
8 years ago
I Can't understand. Please explain me.
ABHISHEK BALIYAN said:
8 years ago
The answer has to be 89 seconds if it is given that this pole is a point of reference on the platform or bridge but is is not mentioned that pole is on the platform thus both the answers are correct it's a tricky question because of the language of the question (consider the question where we give conditions such as a man is standing on a platform that would help you to understand the concept better).
ASR said:
8 years ago
I believe the right answer is 65 Sec.
Because train speed is 10m/Sec and to cross 650-meter bridge it took 65 sec to pass that.
Because train speed is 10m/Sec and to cross 650-meter bridge it took 65 sec to pass that.
Gavendra Shah said:
8 years ago
I also think that 65 is the correct answer.
Radhakrishnan said:
8 years ago
Why can't the answer be 65 according to my explanation?
Speed of the train=(distance /time).
Hence,
240 ÷ 24 =10.
Speed of train is 10 m/s.
Time =distance /speed of the train.
For a 650m platform hence distance is 650.
Time=650m/10m/s.
Hence,
Time =65 sec.
Speed of the train=(distance /time).
Hence,
240 ÷ 24 =10.
Speed of train is 10 m/s.
Time =distance /speed of the train.
For a 650m platform hence distance is 650.
Time=650m/10m/s.
Hence,
Time =65 sec.
Balaji.P said:
8 years ago
I think we don't need to add both the meters of the platform.
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