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.
Vicky said:
1 decade ago
I'm thinking that if it takes 24 seconds to cross 240 m.
Then it takes 48 sec s to cross 480 m with constant speed.
So it takes 240 m = 24 sec.
10 m = 1 sec.
To pass 650 m it takes 65 secs. I'm sure whether this is correct or not. I'm sure that question is not clear.
Then it takes 48 sec s to cross 480 m with constant speed.
So it takes 240 m = 24 sec.
10 m = 1 sec.
To pass 650 m it takes 65 secs. I'm sure whether this is correct or not. I'm sure that question is not clear.
Riya said:
1 decade ago
Yes it takes 65 secs for the front part of the train to reach the platform end but what we need to find is the time taken by the complete train to pass the platform.
i.e. we need to add the time taken to travel a distance equal to its own length.
i.e 65+(240/10) = 89 seconds. 65 seconds is definitely not the answer.
i.e. we need to add the time taken to travel a distance equal to its own length.
i.e 65+(240/10) = 89 seconds. 65 seconds is definitely not the answer.
Raja said:
1 decade ago
The time taken by the train to cross the pole so the train passing the pole (time) is 24sec.
240m = 24secs.
650m = 65secs.
The time taken by the train to passing the station is 65+24 = 89sec.
240m = 24secs.
650m = 65secs.
The time taken by the train to passing the station is 65+24 = 89sec.
Givid said:
1 decade ago
240+650/10.
Why do we divide it by 10 sec finally?
Why do we divide it by 10 sec finally?
Brindha said:
1 decade ago
Train distance + Platform distance = Total time.
Train speed, hence 240+650 = 89.
Speed = 10 m/s.
Train speed, hence 240+650 = 89.
Speed = 10 m/s.
Brindha said:
1 decade ago
Platform: 650 m
Train: 240 m.
If we didn't add distance it means. 65 seconds but the train still in platform.
So add the time to cross the pole with that. Now the correct time is 89 sec.
Train: 240 m.
If we didn't add distance it means. 65 seconds but the train still in platform.
So add the time to cross the pole with that. Now the correct time is 89 sec.
Brindha said:
1 decade ago
Because 10 m/s is speed of train.
Distance = speed/time.
(240+650) = 10/T.
890 (distance).
Time (T) = ?
10 (speed).
Time = 89 sec.
Distance = speed/time.
(240+650) = 10/T.
890 (distance).
Time (T) = ?
10 (speed).
Time = 89 sec.
Swamy said:
1 decade ago
Well,
24 sec ---- 240 mt.
? sec ---- ((650+240)*24)/240 = 89 sec.
24 sec ---- 240 mt.
? sec ---- ((650+240)*24)/240 = 89 sec.
Bishal gupta said:
10 years ago
If 89 sec is the answer then the 890 m long. It is solved answer said 10 m/s. So if the train is 650 m then 65 sec will be the answer.
Manoj Kumar said:
10 years ago
In the question, they have not mentioned that the pole is also on the platform, then how should we consider the train length upto pole also?
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