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 11 of 28.
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?
Bhaskar said:
8 years ago
When the train enters fully from where the platform begins and at the beginning point where the man is standing it takes 20 sec so,
=54*5/18*20= 300 and that is the length of the train.
=54*5/18*20= 300 and that is the length of the train.
Lokesh said:
2 years ago
Given the speed of the train is 54 km/hr.
In 60*60second.
15m in 1 seconds.
90m in 6 seconds.
150m in 10 seconds.
240m in 16 seconds.
Because the time diff is 16 seconds Platform length.
In 60*60second.
15m in 1 seconds.
90m in 6 seconds.
150m in 10 seconds.
240m in 16 seconds.
Because the time diff is 16 seconds Platform length.
(30)
Shivam singh said:
7 years ago
Km/h to m/s.
So,
54kmph = 54*5/18 = 15m/s.
The Length of platform = speed * time difference (because 20 is referral point)
= 15 * (36 - 20) = 240m.
So,
54kmph = 54*5/18 = 15m/s.
The Length of platform = speed * time difference (because 20 is referral point)
= 15 * (36 - 20) = 240m.
Suraj said:
6 years ago
Here, it is solved by taking 15*20 but why?
20 is speed of man not a train. We are taking into account that speed of train. If we take the speed of train then answer will becomes zero.
20 is speed of man not a train. We are taking into account that speed of train. If we take the speed of train then answer will becomes zero.
Ravi Kumar said:
3 years ago
The length of platform = x + 300/36 = 15 m/s.
Can someone explain why we write the 15 m/s on R.H.S of the equation?
I really could not understand. If someone knows then please help me.
Can someone explain why we write the 15 m/s on R.H.S of the equation?
I really could not understand. If someone knows then please help me.
(5)
Mamtha said:
1 decade ago
The train pass the man 20sec, and the train pass a station 36sec.
So,36-20=16sec
Then we know that speed of the train of the train is 54km/hr.
=15m/sec
Therefore, 16*15=240m. Answer.
So,36-20=16sec
Then we know that speed of the train of the train is 54km/hr.
=15m/sec
Therefore, 16*15=240m. Answer.
Vinod Anand said:
1 decade ago
When Speed is =54km/h than 54*5/18.
Speed = 15 m/sec.
Now time are = 30-26 = 16 sec.
The length of the Platform is = 15*16.
= 240 m. (B).
Speed = 15 m/sec.
Now time are = 30-26 = 16 sec.
The length of the Platform is = 15*16.
= 240 m. (B).
Akash said:
8 years ago
Time ratio of train A & B is 27 : 17.
Hence speed ratio of A & B respectively is 17:27.
They meet after 23 sec ,hence 23-17 =6 & 27-23 =4.
Then ratio is 6 : 4 means 3 : 2.
Hence speed ratio of A & B respectively is 17:27.
They meet after 23 sec ,hence 23-17 =6 & 27-23 =4.
Then ratio is 6 : 4 means 3 : 2.
Manikandan said:
8 years ago
According to me, it should be what is the length of the platform from the point man standing for the answer to be 240. Otherwise, the answer is 540.
Please correct me if I am wrong.
Please correct me if I am wrong.
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