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:
487 comments Page 26 of 49.
Robi said:
8 years ago
@Omkar Tanpure.
What is the relative speed? And why 45 is called relative speed? Please explain me.
What is the relative speed? And why 45 is called relative speed? Please explain me.
Muhammad Zulafqar said:
7 years ago
The simplest answer is;
10sec/1000Meter =0.01.
Then multiply with 5KM i.e 0.01 * 5000meter = 50KM.
10sec/1000Meter =0.01.
Then multiply with 5KM i.e 0.01 * 5000meter = 50KM.
Mahinia said:
1 decade ago
Train is same dxn and man is also some dxn it means it means speed is minus x-5 = 125/10*18/5 = 50.
Yrs said:
10 years ago
Both train and man move same direction then relative speed is the sum of train speed and man speed.
Shivam tomar said:
8 years ago
Speed of the train relative to man = 125/10 m/sec.
I am confused in this step, please clarify it.
I am confused in this step, please clarify it.
Rahul agrawal said:
3 years ago
125 m = 10sec
Than 60sec = 125 x 6 = 750m
1hour = 750 x 60 = 45000m (45km/hr) + 5km/hr = 50km/hr.
Than 60sec = 125 x 6 = 750m
1hour = 750 x 60 = 45000m (45km/hr) + 5km/hr = 50km/hr.
(60)
Omsingh more said:
7 years ago
They should mention "relative speed" in the question. Why it is not so? It confuses the examiner!
Nanda said:
1 decade ago
Relative speed = (x-5) km/hr and x-5 = 45.
What is the inner meaning for that can any one say?
What is the inner meaning for that can any one say?
Givid said:
1 decade ago
I have a doubt on question. Whose speed is 5km/hr? either the man's or train's? please explain.
Santhosh K said:
2 years ago
@All.
Why do we minus the speed of the man moving in the same direction? Please explain to me.
Why do we minus the speed of the man moving in the same direction? Please explain to me.
(39)
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