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 14 of 28.
Arzoo said:
9 years ago
Here, platform length is asked then only 36 sec would be considering I think. Because the man is standing on the platform then its passes time covered in 36 sec.
So please give me solution regarding this.
So please give me solution regarding this.
PANASA HARISH KUMAR said:
9 years ago
Friends, I did like this to get an answer. I think it will help you.
Speed of train 54 km/hr 54*5/18 = 15 m/sec
Platform passed in 36 seconds
man stands on platform about 20 seconds
So, 36 - 20 = 16
Length of platform = Speed of train * time taken to pass(leftover seconds from man stood)
Distance = 15*16.
= 240.
Speed of train 54 km/hr 54*5/18 = 15 m/sec
Platform passed in 36 seconds
man stands on platform about 20 seconds
So, 36 - 20 = 16
Length of platform = Speed of train * time taken to pass(leftover seconds from man stood)
Distance = 15*16.
= 240.
R.sai said:
9 years ago
Another method we do that problem.
Train reach time-man standing time = 36-20 = 16.
Length = 15*16 = 240m.
Train reach time-man standing time = 36-20 = 16.
Length = 15*16 = 240m.
Appalaraju said:
9 years ago
d = s*t;
So d = 15 m.
l = x;
x/36-20 = 15.
x = 240.
So d = 15 m.
l = x;
x/36-20 = 15.
x = 240.
Srinivas said:
9 years ago
Actually, here it is asked for platform and train passed the platform. It doesn't matter train passed the man's distance. It's simple L = S*T but why you are including passed by man's time?
Vicky said:
10 years ago
@Suraj we can also apply direct formula of speed on 15.
= 54*5/18 = 15.
Speed = Distance/Time.
15 = X/36-20.
X = 240.
Here 36-20 because both are in towards direction.
= 54*5/18 = 15.
Speed = Distance/Time.
15 = X/36-20.
X = 240.
Here 36-20 because both are in towards direction.
Suraj said:
10 years ago
First convert km/h into m/sec:
= 54*5/18 = 15.
= 15*36-15*20 = 240.
= 54*5/18 = 15.
= 15*36-15*20 = 240.
Kiran said:
10 years ago
Speed of the train will be null.
Kumarchandana said:
10 years ago
It is one of the similar way of improving our aptitude knowledge.
Rock said:
10 years ago
Train speed = 15 m/s.
Time different = 36-20 = 16 sec.
Length of platform is 16*15 = 240 meter.
Time different = 36-20 = 16 sec.
Length of platform is 16*15 = 240 meter.
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