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:
252 comments Page 18 of 26.
Kriti said:
1 decade ago
@VINU
Exactly that would be the total distance travelled by train in 30 sec
Exactly that would be the total distance travelled by train in 30 sec
Rekha said:
10 years ago
Hii @Sai.
Why did you subtract the two things that is length and speed?
Why did you subtract the two things that is length and speed?
Swamy said:
1 decade ago
Well,
36 sec --- 450 mt.
30 sec --- 375 mt.
Then, 375-135 = 275 mt.
36 sec --- 450 mt.
30 sec --- 375 mt.
Then, 375-135 = 275 mt.
Anonymous said:
7 months ago
I am not getting this answer. Anyone, please help me by explaining it.
(7)
Shekar v said:
1 decade 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:
9 years ago
Your explanation is meaningful and understandable. Thanks @Kalimuthu.
Sonu said:
1 decade 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:
2 decades ago
sai your explanation is clear and better explanation thanks to all
Kiran said:
1 decade 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:
7 months 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.
(14)
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