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:
494 comments Page 4 of 50.
Murugan S said:
2 years ago
HERE,
1hr = 3600sec then, 1sec = 1/3600hr
1km =1000m then, 1m = 1/1000km
So,
km/hr to m/s is : 1/1000km bigger divided by 1/3600hr.
So, they put 18/5.
1hr = 3600sec then, 1sec = 1/3600hr
1km =1000m then, 1m = 1/1000km
So,
km/hr to m/s is : 1/1000km bigger divided by 1/3600hr.
So, they put 18/5.
(22)
Karthik said:
2 years ago
125/10 = 12.5,
12.5 * 3.6 = 45,
45 + 5 = 50.
12.5 * 3.6 = 45,
45 + 5 = 50.
(22)
PRajashree said:
2 years ago
3600sec then, 1sec = 1/3600hr.
1km =1000m then, 1m = 1/1000km.
So,
km/hr to m/s is : 1/1000km bigger divided by 1/3600hr.
So, they put 18/5.
1km =1000m then, 1m = 1/1000km.
So,
km/hr to m/s is : 1/1000km bigger divided by 1/3600hr.
So, they put 18/5.
(21)
Sheital saira said:
3 years ago
@Hemanth sairam.
Why 60 mins and 60 seconds taken there?
Please explain me.
Why 60 mins and 60 seconds taken there?
Please explain me.
(19)
Owona Julius said:
3 years ago
How - 5 came? Please explain this step.
(17)
Shanthi said:
3 years ago
How this 18/5 come? please explain to me.
(17)
Sayak Chakraborty said:
3 years ago
How 18/5 came after 25/2? Please answer.
(16)
Suja said:
1 year ago
How it 18รท5 will become? Please explain.
(16)
Menaka said:
7 months ago
Why commonly mention that 5/18? Please explain.
(16)
Ravi prasad said:
2 months ago
Relative speed = x - 5.
Formula:
Relative speed = Distance/time.
(x-5) 5/18 = 125/10.
X = (12. 5x18/5) + 5.
= 45 + 5 = 50km/hr.
Formula:
Relative speed = Distance/time.
(x-5) 5/18 = 125/10.
X = (12. 5x18/5) + 5.
= 45 + 5 = 50km/hr.
(16)
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