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 4 of 8.
Gurwinder singh said:
8 years ago
Why (x*5/18) mps?
Prasad kapal said:
8 years ago
But we added 500 with 140.
Paddy said:
2 decades ago
1km=1000m,1hr=60min*60sec i.e1km/hr=1000/60*60i.e 5/18
PANASA HARISH KUMAR said:
1 decade 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.
Rohan said:
7 years ago
Why we have to add the length of the train?
Dwaraka said:
2 decades ago
Hi rajasekaran the solution
speed=55km/hr
= (55*1000)/(60*60)
=15.27m/s
Total distance=the bridge distance+distance of the train to cross the bridge
d=470+140=610
time=d/s=610/15.27=39.94s
speed=55km/hr
= (55*1000)/(60*60)
=15.27m/s
Total distance=the bridge distance+distance of the train to cross the bridge
d=470+140=610
time=d/s=610/15.27=39.94s
Antony said:
2 decades ago
How it should come 25/2,could you explain me as soon as possible
Rajasekaran said:
2 decades ago
A train 470 m long is running at a speed of 55 km/hr. In what time will it pass a bridge 140 m long?
pls explain it
pls explain it
Ramashish mallah said:
2 decades ago
Thank You.
Rahul, You explained very well and cleared all my confusing.
I am greatful to you.
Regards,
Ramashish Mallah
ramashish.mallah[at]gmail.com
Rahul, You explained very well and cleared all my confusing.
I am greatful to you.
Regards,
Ramashish Mallah
ramashish.mallah[at]gmail.com
Sreee said:
6 years ago
Please explain to me why we are adding train length and bridge length. The train is moving on the bridge only.
And they asked only the time taken to move on the bridge.
Please explain to me in detail.
And they asked only the time taken to move on the bridge.
Please explain to me in detail.
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