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:
478 comments Page 39 of 48.
Yuvraj said:
8 years ago
Speed=Distance(length of train)/Time;
s=125/10;
But s is (speed of train and man together i.e man's speed is 5km/hr so convert 5*(5/18)& train and man going in same direction that's why -X (let the speed of train)
(X*(5/18))-(5*(5/18))=125/10,
x-5=45,
x=50.
s=125/10;
But s is (speed of train and man together i.e man's speed is 5km/hr so convert 5*(5/18)& train and man going in same direction that's why -X (let the speed of train)
(X*(5/18))-(5*(5/18))=125/10,
x-5=45,
x=50.
Mustufa said:
8 years ago
As we find train speed pass near to man is 45 km/hr and man also running at speed of 5 km/hr so we add train speed with man speed so we get the exact speed of train.
Vasu erothi said:
8 years ago
a km/hr to m/s conversion.
a km/hr =[a*5/18]m/s.
a km/hr =[a*5/18]m/s.
Arup said:
8 years ago
What is 18/5?
Please explain.
Please explain.
Nivetha said:
8 years ago
What is the meaning of (x-5) then, x-5=45?
Please explain this line.
Please explain this line.
Gilbert said:
8 years ago
I think, 18/5 is seconds per meter not metres per second.
Prosenjit said:
8 years ago
Let the speed of the train x in one second.
So their combined speed=x-{5000/(60*60)}=x-1.39 in one second,
so, 125/x-1.39=10,
x=13.89 (in one second),
So 50000m=50 km in hour.
So their combined speed=x-{5000/(60*60)}=x-1.39 in one second,
so, 125/x-1.39=10,
x=13.89 (in one second),
So 50000m=50 km in hour.
Imran said:
8 years ago
@Nivetha.
(x-5) is additional speed for overcrossing, the relative speed is 50-5=45. So here answer is 50 because (x-5) is crossing speed.
(x-5) is additional speed for overcrossing, the relative speed is 50-5=45. So here answer is 50 because (x-5) is crossing speed.
Bijayalaxmi priyadarsini said:
8 years ago
Hello please solve this question.
A 180meter long train crosses a man walking the same direction at a speed of 7. 2km per hour in 10 seconds what is the speed of train?
A 180meter long train crosses a man walking the same direction at a speed of 7. 2km per hour in 10 seconds what is the speed of train?
Ladura said:
8 years ago
What is the distance covered by the man in 10 seconds?
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