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:
245 comments Page 22 of 25.
Surekha said:
8 years ago
How would you say that bridge length would be more that train?
If bridge length is smaller than train means the answer would be vary.
If bridge length is smaller than train means the answer would be vary.
Vaibhav mittal said:
8 years ago
Total distance covered by train in crossing the bridge = (25/2) *30=375.
Length of bridge = 375-130 =245.
Length of bridge = 375-130 =245.
Sid said:
8 years ago
From where 5/18 comes?
Please tell me.
Please tell me.
Irene said:
8 years ago
From this formula 2 (130 + x) = 750 ,shouldn't the 2 outside multiple both 130 and x?
I believe it shd be;
160+2x =750,
2x=750-160,
2x=590/2,
x=295m,
2(130+x)=750.
I believe it shd be;
160+2x =750,
2x=750-160,
2x=590/2,
x=295m,
2(130+x)=750.
Sowmiya said:
8 years ago
Nice explanation @Coolburn.
Abd said:
8 years ago
How 750? Explain please.
Zainab said:
8 years ago
@Anil Bhadani.
Clear explanation.
Clear explanation.
Naveen said:
8 years ago
Why you added train length and bridge length?
Patel said:
8 years ago
Nice explanation @Rajesh.
Manoj Reddy said:
8 years ago
Nice explanation @Rajesh.
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