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 5 of 21.
Sanjay said:
1 decade ago
I think KUmar is correct...
Krishna said:
1 decade ago
Data is not sufficient where is the pole length ?????
if the train is passing a platform of length 650m
then time taken = (650+240)/speed of train
speed of train = (length of train + length of pole) / 24 sec
= (240 + length of pole)/24 sec
note : 240/24 is not always correct ...
if the train is passing a platform of length 650m
then time taken = (650+240)/speed of train
speed of train = (length of train + length of pole) / 24 sec
= (240 + length of pole)/24 sec
note : 240/24 is not always correct ...
Jellli said:
1 decade ago
Hi, I think
1.first we have to find speed of the train
s=240/24=10(in cond of the the train sross the pole)
2.then the same cross the platform of 630m then t=?
s=d/t
t=d/s=(240+650)/10(here we have to add the both len of train and platform)
=89s
1.first we have to find speed of the train
s=240/24=10(in cond of the the train sross the pole)
2.then the same cross the platform of 630m then t=?
s=d/t
t=d/s=(240+650)/10(here we have to add the both len of train and platform)
=89s
Sumi said:
1 decade ago
Why do you want the pole length here you just wana find the length of the platform we use the pole length as the reference point only to calculate the length of the train for platform instead of pole length add the platform length.
Tulsi said:
1 decade ago
The distance taken by the train is nothing but the time taken by the train to cross the pole so ... the train passing the pole(time) is 24sec.
ie 240m ->24
slly
650->65sec.
The total time taken by the train to passing the station is=65+24=89sec.
ie 240m ->24
slly
650->65sec.
The total time taken by the train to passing the station is=65+24=89sec.
Tulsi said:
1 decade ago
The distance taken by the train is nothing but the time taken by the train to cross the pole so ... the train passing the pole(time) is 24sec.
ie 240m ->24
slly
650->65sec.
The total time taken by the train to passing the station is=65+24=89sec.
ie 240m ->24
slly
650->65sec.
The total time taken by the train to passing the station is=65+24=89sec.
Dharmendra ISIT said:
1 decade ago
The answer will be 65 only bcoz
train which is 240m long passes a pole in 24sec
so the speed of train is 240/24=10m/s
when speed of train is 10m/s then what time it will take to cross the platform which is 650m long i.e 650/10=65sec
two distance will be add when question will be like this
A train 240 m long passes a platform which is 650m long in 24 seconds the speed of train is?
train which is 240m long passes a pole in 24sec
so the speed of train is 240/24=10m/s
when speed of train is 10m/s then what time it will take to cross the platform which is 650m long i.e 650/10=65sec
two distance will be add when question will be like this
A train 240 m long passes a platform which is 650m long in 24 seconds the speed of train is?
Hitesh said:
1 decade ago
We add both of them because we have to calculate the time taken to cross the platform. 240 is the length of train. So total distance, the engine has to cover is 240 (train length) + 650 (platform length).
Saiyam said:
1 decade ago
Length of platform = 640m
and entire train length = 240m
the Q. is we have to find time taken by train to pass entire platform.
so we include train length utill its last coach passing the platform.
time considered up to its last coach left the platform.
ok.
and entire train length = 240m
the Q. is we have to find time taken by train to pass entire platform.
so we include train length utill its last coach passing the platform.
time considered up to its last coach left the platform.
ok.
Vels said:
1 decade ago
Anyone explain
They are asking 650 only know. Then why we are adding 240+650.
They are asking 650 only know. Then why we are adding 240+650.
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