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:
204 comments Page 18 of 21.
Sarang said:
8 years ago
Distance= speed * time,
240/ 24=time,
Time = 10s,
Distance= speed* time.
240+ 650 combing distance = 890,
890/10= time,
89 m/s.
240/ 24=time,
Time = 10s,
Distance= speed* time.
240+ 650 combing distance = 890,
890/10= time,
89 m/s.
Onono solomon said:
8 years ago
Here, the question is asking for a specific time taken by the train to pass the platform (650/10 =65) not the total time is taken. If at all they asked for total time, we would add them up (65+24).
Agnel said:
8 years ago
240/24=10,
.:650/10=65+24=89.
.:650/10=65+24=89.
Gebrekidan Adugna said:
8 years ago
240=24sec.
then 650=x.
240x=650*24,
240x/240=650*24/240,
= 65m/s.
then 650=x.
240x=650*24,
240x/240=650*24/240,
= 65m/s.
Rajesh said:
8 years ago
It should be 65 sec only.
Analysis: The speed of the train is the same in both cases. For the constant speed,
(distance/time) in first case = (distance/time) in second case.
240/24=650/x==> x = 65 sec.
Analysis: The speed of the train is the same in both cases. For the constant speed,
(distance/time) in first case = (distance/time) in second case.
240/24=650/x==> x = 65 sec.
Rajesh said:
8 years ago
Here, it should come 890 instead of 650. We should add both the values. So the correct answer is 89sec.
Rosha Gangani said:
8 years ago
The Answer is 65s, because the question in not mention both pole and platform then why we calculate both?
Ando Lawrence said:
8 years ago
Accurate Answer is 89 sec only.
@All.
In case of crossing a man/post/pole:
Usually, we will ignore the length of man/post/pole. If you want the result of speed in 'millimetres/second' accuracy, you can add length of the man or pole to the length of the train.
@All.
In case of crossing a man/post/pole:
Usually, we will ignore the length of man/post/pole. If you want the result of speed in 'millimetres/second' accuracy, you can add length of the man or pole to the length of the train.
Pravat kumar nayak said:
8 years ago
I think the answer is 65sec.
240m long a pole passes away in 24 sec.
So, Time = distance ÷ speed.
240÷24 = 10 sec.
How long will take to pass a platform 650 m long?
Ans-650÷10 = 65m/s.
240m long a pole passes away in 24 sec.
So, Time = distance ÷ speed.
240÷24 = 10 sec.
How long will take to pass a platform 650 m long?
Ans-650÷10 = 65m/s.
Veeru said:
8 years ago
As the train has to pass the platform its length need to be considered so they added 240 to the platform length.
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