Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 2)
2.
A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:
Answer: Option
Explanation:
| Speed of the train relative to man = |  |
125 |  m/sec |
| 10 |
| = | |
25 | m/sec. |
| 2 |
| = | |
25 | x | 18 | km/hr |
| 2 | 5 |
= 45 km/hr.
Let the speed of the train be x km/hr. Then, relative speed = (x - 5) km/hr.
x - 5 = 45 
x = 50 km/hr.
Discussion:
475 comments Page 28 of 48.
Shro said:
1 decade ago
Thanku Rahul. Your explanation was easy to understand and cleared my doubts too :).
Rishabh Suthar said:
9 years ago
Same direction then we do subtract and opposite direction then we do addition. Why?
Shabana said:
1 decade ago
Hi, Really the explanation given by Dattatray & Rahul was superb. Thanks guys.
Hemavathy said:
1 decade ago
How the will be 50?
Speed = 25/2(m/s).
Converting(m/s)to(km/hr).
25/2*18/5 = 45.
Speed = 25/2(m/s).
Converting(m/s)to(km/hr).
25/2*18/5 = 45.
Sarah said:
1 decade ago
Hi I can't understand friends. What is this x-5 ?
Please anyone explain clearly.
Please anyone explain clearly.
Velu said:
1 decade ago
Here they are asking the train speed. But why we are finding the relative speed.
Siva laxman said:
8 years ago
The relatie speed of the train = if opp direction = s1+s2.
Same direction s1~s2.
Same direction s1~s2.
Preetha said:
1 decade ago
Hi friends, I can't understand this please anyone help me in some other method.
Pradeep said:
1 decade ago
Can you please explain me what is relative speed here and why it is used here ?
Ravindra said:
1 decade ago
X-5 = 45 is right because train and man same side. In same side it is correct.
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