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:
78 comments Page 2 of 8.
Shubham Jain said:
6 years ago
How come 25/2?
(1)
Nibha said:
6 years ago
Why 140m is added?
(1)
Sai said:
6 years ago
450mts ----> 36sec.
500mts ---> 40sec.
500mts ---> 40sec.
(1)
Anush said:
6 years ago
Why we are adding the train length with bridge length?
(1)
Sujith kumar said:
9 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)
Prasad kapal said:
7 years ago
But we added 500 with 140.
Praveena said:
10 years ago
Why should we add 360 and 140?
A train of length 360 is moving on 140 m bridge. It is not covering 360 m distance and 140 m distance. Then why should we add two lengths?
A train of length 360 is moving on 140 m bridge. It is not covering 360 m distance and 140 m distance. Then why should we add two lengths?
PANASA HARISH KUMAR said:
9 years ago
Train long = 360m.
Speed 45*5/18 = 12.5m/sec.
Bridge long = 140m.
Time = ?
Speed = Distance/Time
12.5 = 360 + 140/time.
Time = 40sec.
Speed 45*5/18 = 12.5m/sec.
Bridge long = 140m.
Time = ?
Speed = Distance/Time
12.5 = 360 + 140/time.
Time = 40sec.
Virang soni said:
9 years 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:
9 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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