Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 23)
23.
Two trains are running in opposite directions with the same speed. If the length of each train is 120 metres and they cross each other in 12 seconds, then the speed of each train (in km/hr) is:
Answer: Option
Explanation:
Let the speed of each train be x m/sec.
Then, relative speed of the two trains = 2x m/sec.
| So, 2x = | (120 + 120) |
| 12 |
2x = 20
x = 10.
 Speed of each train = 10 m/sec = |
 |
10 x | 18 |  |
km/hr = 36 km/hr. |
| 5 |
Discussion:
38 comments Page 3 of 4.
Santhosh said:
1 decade ago
It is the length of two trains i.e., (120+120)
and 18/5 is conversion of m/s to km/hr.
and 18/5 is conversion of m/s to km/hr.
Vaibhav said:
8 years ago
Can anyone tell me that answer is asked in km\hr, but the answer given is s\m?
Why?
Why?
Saanvi S said:
2 years ago
S = D/S.
S = 120/12.
Therefore; S = 10 m/sec.
S = 10 × 18/5
And S = 36 kmph.
S = 120/12.
Therefore; S = 10 m/sec.
S = 10 × 18/5
And S = 36 kmph.
(6)
Divya said:
1 decade ago
Why we have to take 60*60 and why we have to convert 120 to km not km/hr?
Vaibhav Singh said:
1 decade ago
If we are talking about relative distance then it should be only 120m.
Joel said:
1 decade ago
Guys here, each train is travelling 120 m so total distance is 240 m.
Shafiq said:
9 years ago
Why the relative speed of the two trains is taken as 2x?
Irshad said:
1 decade ago
In option no units are given then why should we convert.
Stuti said:
5 years ago
S=D/T.
S=120/12= 10m/sec,
=10*(18/5)=36km/hr.
S=120/12= 10m/sec,
=10*(18/5)=36km/hr.
(2)
Yogesh said:
1 decade ago
18/5 why & where command please clarify it?
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