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 14 of 48.
Raja said:
1 decade ago
Thank you friends I understood well never before.
Every one has given their own ideology with respect to problem.
Every one has given their own ideology with respect to problem.
Umesh said:
1 decade ago
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:
====> dist. travelled by man in 10 sec. = (5*5/18) *10=250/18
A train will have to travel its own length + dist.travelled by man. (when train will pass the man he would have travelled 125/9 m in same dir.)
i.e. 125+125/9 meters = 1250/9
speed of train = (1250/9)/10 = 125/9 m/s=125/9 *18/5 = 50 km/hr
====> dist. travelled by man in 10 sec. = (5*5/18) *10=250/18
A train will have to travel its own length + dist.travelled by man. (when train will pass the man he would have travelled 125/9 m in same dir.)
i.e. 125+125/9 meters = 1250/9
speed of train = (1250/9)/10 = 125/9 m/s=125/9 *18/5 = 50 km/hr
Tarun dumra said:
1 decade ago
Nice expalnation by ankita.
Vandna said:
1 decade ago
Can anyone solve this?
A train moving at 36Kmph takes 12 seconds to cross a platform. It takes 6 seconds to cross a man running at the rate of 9Kmph in the opposite direction. Find the length of the train.
A train moving at 36Kmph takes 12 seconds to cross a platform. It takes 6 seconds to cross a man running at the rate of 9Kmph in the opposite direction. Find the length of the train.
Shiwam said:
1 decade ago
@vandna
It is option checking question so option must be given.
Since it has 3 variables plateform length,train length & train speed.
it might be done by option checking.
It is option checking question so option must be given.
Since it has 3 variables plateform length,train length & train speed.
it might be done by option checking.
Vijaya said:
1 decade ago
Hi amit and Sarah
Here x - 5 = 45
x= 45 + 5 (when minus (-) simble comes from right of = to left of = it will become +.
Here x - 5 = 45
x= 45 + 5 (when minus (-) simble comes from right of = to left of = it will become +.
G.Humayun said:
1 decade ago
Thanks friends its very useful.
Preetha said:
1 decade ago
Hi friends, I can't understand this please anyone help me in some other method.
Gnana said:
1 decade ago
Very nice vandha.
Sagar said:
1 decade ago
Finally we need to find speed me train. But in problem train speed is compared with moving object i.e man. So (total speed of train-speed of man=relative speed).
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