Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 3)
3.
The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
Answer: Option
Explanation:
| Speed = |  |
45 x | 5 |  m/sec |
= | |
25 | m/sec. |
| 18 | 2 |
Time = 30 sec.
Let the length of bridge be x metres.
| Then, | 130 + x | = | 25 |
| 30 | 2 |
2(130 + x) = 750
x = 245 m.
Video Explanation: https://youtu.be/M_d8WufJWKc
Discussion:
247 comments Page 18 of 25.
Shekar v said:
10 years ago
45000 meters/3600 seconds = 12.5.
12.5*30 sec = 375.
375-130 = 245.
12.5*30 sec = 375.
375-130 = 245.
Aadhii said:
8 years ago
Your explanation is meaningful and understandable. Thanks @Kalimuthu.
Sonu said:
10 years ago
Hi,
Could you please advise why we added x to the distance covered?
Could you please advise why we added x to the distance covered?
Mannsoorkhan said:
1 decade ago
sai your explanation is clear and better explanation thanks to all
Kiran said:
10 years ago
Hi @Anjaneyulu,
5/18 is just to convert the speed km/hr into m/s.
5/18 is just to convert the speed km/hr into m/s.
Sidheswar Pradhan said:
2 days ago
1 km/hr = 1km/1hr.
= 1000 m/3600 sec,
= 10/36 m/s,
= 5/18 m/s.
= 1000 m/3600 sec,
= 10/36 m/s,
= 5/18 m/s.
Reethu said:
10 years ago
Hi,
Can anyone explain what is 5/18 here? I couldn't get this.
Can anyone explain what is 5/18 here? I couldn't get this.
Anjaneyulu said:
10 years ago
Hi,
Can anyone explain what is 5/18 here? I couldn't get this.
Can anyone explain what is 5/18 here? I couldn't get this.
Maanvi said:
9 years ago
@Naveen Kumawat.
Nice description to understand the problem.
Nice description to understand the problem.
TheInternetGuy said:
1 decade ago
Is 45 km/hr relative speed between the bridge and the train?
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