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 17 of 21.
Viji said:
1 decade ago
Neetu your explanation cleared my doubt. Thanks.
Suki said:
1 decade ago
Neetu's explanation s very nice.
Umesh said:
1 decade ago
A train 240 m long passes a pole in 24 seconds. How long will it take to pass a platform 650 m long?
=====> for the tail of train to clear the platform it has to pass its own length + platform length.(240+650=890 m)
for 240 m. -- 24 sec.
for 890 m
by observation 890 is @ 4 times (some less) to 240
so time is also @ 4 times of 24 (some less) i,e. 96
from options 89 is @96 & somewhat less.
=====> for the tail of train to clear the platform it has to pass its own length + platform length.(240+650=890 m)
for 240 m. -- 24 sec.
for 890 m
by observation 890 is @ 4 times (some less) to 240
so time is also @ 4 times of 24 (some less) i,e. 96
from options 89 is @96 & somewhat less.
HARI said:
1 decade ago
Dudes,
Actually the length is calculated along with the train only as (650+240). The passing of the platform is for the train, so that, train tail has to pass the platform; Henceforth,
(Train+ Platform)is correct
Actually the length is calculated along with the train only as (650+240). The passing of the platform is for the train, so that, train tail has to pass the platform; Henceforth,
(Train+ Platform)is correct
Kartikey patel said:
1 decade ago
I think in question ask the time taken for only bridge 650. Then why we add both?
Pavan said:
1 decade ago
Pavan,
hello dudes there is a simple common sense
The length of the train is 240m
The length of the platform is 650m
So the total dstn to cross is (240+650)
=890m
ther fore
890/spd
=890/10
=89sec
hello dudes there is a simple common sense
The length of the train is 240m
The length of the platform is 650m
So the total dstn to cross is (240+650)
=890m
ther fore
890/spd
=890/10
=89sec
Neetu said:
1 decade ago
We are adding 240 and 650 because the train needs to cross the entire platform. CROSSING means the last coach should cross the end of the platform. That's why we are adding both lenghts.
Kiran,
We cannot solve in your way because a train will never take the same time in crossing a pole and a platform. The train crossing the pole and crossing the platform is not same.
Kiran,
We cannot solve in your way because a train will never take the same time in crossing a pole and a platform. The train crossing the pole and crossing the platform is not same.
Koteswararao said:
1 decade ago
In order to determine the speed the distance of the train can we ignore the distance between the train and the pole.
Kiran said:
1 decade ago
Guys I'm new to here can u ppl plz help....
Whyy can't i solve dis problem in disz way...
240 meters in 24 secs..
650 meters means ??
(650*24)/240 = 65 meters...
is this wrong ....
plzzz help me...
Whyy can't i solve dis problem in disz way...
240 meters in 24 secs..
650 meters means ??
(650*24)/240 = 65 meters...
is this wrong ....
plzzz help me...
Taj said:
1 decade ago
I'm so confused answer is 65 or 89.
If you sat 89 how it is come?
If you sat 89 how it is come?
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