Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 5)
5.
A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?
Answer: Option
Explanation:
| Speed = |  |
54 x | 5 |  m/sec = 15 m/sec. |
| 18 |
Length of the train = (15 x 20)m = 300 m.
Let the length of the platform be x metres.
| Then, | x + 300 | = 15 |
| 36 |
x + 300 = 540
x = 240 m.
Discussion:
279 comments Page 17 of 28.
Manoj dhawade said:
1 decade ago
We have to do 15*(36-20) because train crosses the platform in 36 sec and the man in 20 sec. So the answer should be 240 m.
Virender Singh said:
5 years ago
Answer 240m is possible only if the man is standing at the end of the station.
Am I right or wrong? Please anyone clarify.
Am I right or wrong? Please anyone clarify.
(6)
Divya said:
1 decade ago
I solved in dis manner
54*(5/18)=15
speed =15m/sec
it crossed d platform within 36 secs
for 20 sec=?
36-20=16
16*15=240m
54*(5/18)=15
speed =15m/sec
it crossed d platform within 36 secs
for 20 sec=?
36-20=16
16*15=240m
Sunil Ranjan Samantaray said:
1 decade ago
Why length of the train will be 15*20 = 300?
Why not, length of train will be 15*36 = 540?
Please justify the reason.
Why not, length of train will be 15*36 = 540?
Please justify the reason.
Raghul said:
6 years ago
There is no length for man hence,
L/15 = 20.
L= 300.
And platform has length hence,
L+B/15 =36.
300+B = 540.
B=240.
L/15 = 20.
L= 300.
And platform has length hence,
L+B/15 =36.
300+B = 540.
B=240.
Harsh said:
7 years ago
I think the answer should be 540.
Because, how can the length of the platform be less than the length of the trian?
Because, how can the length of the platform be less than the length of the trian?
Sara said:
2 decades ago
We can take 15x20 as the train length only if the man is standing at the beginning of the platform. Am I correct.
Reshmi said:
1 decade ago
I have the same doubt & Its not clear from all these explanations. Why you took 15*20 as the distance value?
Surender Kashyap said:
1 decade ago
L/20 = (L+P)/36 = 54*5/18
using compenondo and dividendo means (L+P)-L/36-20
P/16 = 15
SO, P = 15*16
P = 240
using compenondo and dividendo means (L+P)-L/36-20
P/16 = 15
SO, P = 15*16
P = 240
Kiruthika said:
2 months ago
To find the length of the train why we use a 20-second time instead of 36 seconds? Anyone please explain to me.
(8)
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