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:
254 comments Page 26 of 26.
Sathish said:
7 years ago
45 * (5÷18) = (Lb +130)/30.
Lb = 245 m.
Lb = 245 m.
Sejarc said:
7 years ago
It's simple one.
The train goes on a speed of 12.5 m/sec (45km/hr). So it crosses 375m in 30 sec.
Simply, 375 m - length of the train (130 m) =245 m (length of the bridge) => answer.
The train goes on a speed of 12.5 m/sec (45km/hr). So it crosses 375m in 30 sec.
Simply, 375 m - length of the train (130 m) =245 m (length of the bridge) => answer.
Navin said:
6 years ago
How 25/2 came? Explain, please.
Kaushik vinay said:
6 years ago
45*18/5 = 25/3.
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