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:
282 comments Page 19 of 29.
Kumarchandana said:
1 decade ago
It is one of the similar way of improving our aptitude knowledge.
Kiran said:
1 decade ago
Speed of the train will be null.
Suraj said:
1 decade 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.
Vicky said:
1 decade 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.
Srinivas said:
1 decade 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?
Appalaraju said:
1 decade 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.
R.sai said:
1 decade 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.
PANASA HARISH KUMAR said:
1 decade 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.
Arzoo said:
10 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.
Lekh Raj ghallet said:
10 years ago
All of you have got answer rightly. According to my understanding, time spent by a train to cross a man is at the 20s. A man is standing at an extreme end of a train. Thus, a length of the train could be traded.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers