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:
276 comments Page 21 of 28.
Guru said:
1 decade ago
The time taken by train to cross platform is=36-20=16sec.
Speed of train=54*(5/18)m/s.
Distance(length)=speed*time.
=54*(5/18)*16.
=240m.
Speed of train=54*(5/18)m/s.
Distance(length)=speed*time.
=54*(5/18)*16.
=240m.
Priyanka said:
1 decade ago
Train passes in 36 secs, man standing in 20 secs.
therefor, 36-20= 16 secs.
now, speed = 54 km/hr.
= {54 X 5/18} = 15 m/sec.
here, length = speed X time
= 15 X 16
= 240 m. ans
therefor, 36-20= 16 secs.
now, speed = 54 km/hr.
= {54 X 5/18} = 15 m/sec.
here, length = speed X time
= 15 X 16
= 240 m. ans
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
Shiji said:
1 decade ago
Why don`t we take the length of the train=15*36.
Gopu said:
1 decade ago
Simple method;.
Convert train speed into m/sec=54*5/18.
=15m/s.
Subtract train time which it had taken to cross a man from the time taken by train to cross the platform i.e,
= (36-20).
=16.
Now apply formula of distance i.e. speed*time.
=15*16.
=240. ) ).
Convert train speed into m/sec=54*5/18.
=15m/s.
Subtract train time which it had taken to cross a man from the time taken by train to cross the platform i.e,
= (36-20).
=16.
Now apply formula of distance i.e. speed*time.
=15*16.
=240. ) ).
Ravinder Kumar said:
1 decade ago
The simple method is
Train speed is 54km/h*5/18=15m/second
Time taken between man standing on platform and station platform ( 36-20) = 16 sec.
Distance= 15*16 = 240m
Train speed is 54km/h*5/18=15m/second
Time taken between man standing on platform and station platform ( 36-20) = 16 sec.
Distance= 15*16 = 240m
Prakash ranjan naik said:
1 decade ago
Train speed=15m/s
Time=20s
If train pass man means,that is the tme of train
That's why
Length of train=15x20
Time=20s
If train pass man means,that is the tme of train
That's why
Length of train=15x20
Praveen prabhakar said:
1 decade ago
Distance=speed*time
Distance=(54*5/18)*(36-20)=240m
Distance=(54*5/18)*(36-20)=240m
Sudhapriya said:
1 decade ago
Thank you vetri. I gained answer from you.
Veeresh said:
1 decade ago
xkmph means train goes x meters in 3.6 seconds. here 36-20secs required to travel for the train to pass platform.
3.6 sec---->54 meters
16 secs---->?
16/3.6x54=240 meters
3.6 sec---->54 meters
16 secs---->?
16/3.6x54=240 meters
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