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 6 of 8.
Yash said:
1 decade ago
The Distance travelled by train + bridge length should divide with speed. Simple logic.
Anushiya said:
3 years ago
Aakriti.
Suppose I take the length as 140 only then what happened? Please explain me.
Suppose I take the length as 140 only then what happened? Please explain me.
(5)
Shruthi Bhosle said:
9 years ago
We should find time only for distance of 140m long, why we add (360 + 140).
PrinceDarwin said:
2 decades ago
45 x 5/18 m/sec = 25/2 m/sec. I CANTT UNDERSTAND THE LOGIC. Plese explain
Lavi chaudhary said:
7 years ago
@All.
First of all, 360*5/18=1800/18=100 and finally 140-100=40 ans.
First of all, 360*5/18=1800/18=100 and finally 140-100=40 ans.
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.
Antony said:
2 decades ago
How it should come 25/2,could you explain me as soon as possible
Swayoni said:
1 decade ago
Why the distance is calculated as (360+140) ? why not only 360?
Vidhya said:
1 decade ago
I understand the problem. But why we add 360+140. Explain.
Paddy said:
2 decades ago
1km=1000m,1hr=60min*60sec i.e1km/hr=1000/60*60i.e 5/18
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