Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 8)
8.
A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
Answer: Option
Explanation:
| Formula for converting from km/hr to m/s: X km/hr = |  |
X x | 5 |  |
m/s. |
| 18 |
| Therefore, Speed = | |
45 x | 5 | m/sec |
= | 25 | m/sec. |
| 18 | 2 |
Total distance to be covered = (360 + 140) m = 500 m.
| Formula for finding Time = | |
Distance | |
| Speed |
 Required time = |
|
500 x 2 | sec |
= 40 sec. |
| 25 |
Discussion:
79 comments Page 2 of 8.
Sundar said:
2 decades ago
Hi Naveen,
Time = Distance / Speed
Here,
Distance = 500 m.
Speed = 25/2
Therefore, Time = 500/ (25/2)
Time = 500/12.5 = 40 sec.
or
Time = 500 x 2 / 25 = 40 sec.
Time = Distance / Speed
Here,
Distance = 500 m.
Speed = 25/2
Therefore, Time = 500/ (25/2)
Time = 500/12.5 = 40 sec.
or
Time = 500 x 2 / 25 = 40 sec.
(1)
Sujith kumar said:
10 years ago
Speed = 45km/hr = 45 * 1000/60 * 60 = 12.5m/ec.
Length = Speed * Time.
360 + 140 = 12.5 * time.
Time = 500/12.5 = 40sec.
Length = Speed * Time.
360 + 140 = 12.5 * time.
Time = 500/12.5 = 40sec.
(1)
Anush said:
7 years ago
Why we are adding the train length with bridge length?
(1)
Sai said:
7 years ago
450mts ----> 36sec.
500mts ---> 40sec.
500mts ---> 40sec.
(1)
Nibha said:
7 years ago
Why 140m is added?
(1)
Shubham Jain said:
7 years ago
How come 25/2?
(1)
DHANASURIYA M G said:
3 months ago
Agree, the train will take 40 seconds to pass the bridge.
(1)
Sam said:
2 decades ago
Hi How x*5/18 came there can't understand
Virang soni said:
1 decade ago
d = s * t = 45 * (5/18) = 12.5.
Total length = 360 + 140/12.5 = 40.
Total length = 360 + 140/12.5 = 40.
Anonymous said:
10 years ago
In this question, the length of the bridge is shorter than that of the train. Then why we go for adding the two lengths?
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