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.
Jyoti said:
10 years ago
Train takes 25/2 sec to travel 360 m, then how it's possible that it is taking same 25/2 sec to travel 500 m as well if it takes 25/2 sec for 360 m then it should take x sec to travel 500 m and then cross multiply and get value of x and that will be time taken to travel 500 m.
Am I right? Please explain.
Am I right? Please explain.
Hardik Patel said:
9 years ago
@Shruthi.
140m is a only bridge length.
If you consider only 140 m length it means only first point of train cross a bridge not whole train.
If you add a 340 m(length of the train) in 140m it means the whole train cross the bridge.
so add (360+140).
140m is a only bridge length.
If you consider only 140 m length it means only first point of train cross a bridge not whole train.
If you add a 340 m(length of the train) in 140m it means the whole train cross the bridge.
so add (360+140).
Sameena kabir said:
8 years ago
Please, anyone can solve this one I can't understand how to tackle this one?
A train travell 34 km in 54mints. How far a train travell in 60 mints.
A train travell 34 km in 54mints. How far a train travell in 60 mints.
Sarang said:
8 years ago
Distance = speed *time.
360+140=45*5/18*time,
500=5*5*/2*time,
500=25/2*time,
500=12.5*time,
500/12.5=time,
Time = 40 second.
360+140=45*5/18*time,
500=5*5*/2*time,
500=25/2*time,
500=12.5*time,
500/12.5=time,
Time = 40 second.
Lavi chaudhary said:
8 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.
ANIL said:
8 years ago
Given,
length of the train =360m,
speed of train =45km/h,
length of the bridge =140m,
time =T.
Now convert 45km/h=45*5/18=225/18m/s.
Total length=360m+140m=500m.
We know speed =distance/time.
=> 225/18=500/T.
=> T=500*18/225.
=> T=40s.
length of the train =360m,
speed of train =45km/h,
length of the bridge =140m,
time =T.
Now convert 45km/h=45*5/18=225/18m/s.
Total length=360m+140m=500m.
We know speed =distance/time.
=> 225/18=500/T.
=> T=500*18/225.
=> T=40s.
Gurwinder singh said:
8 years ago
Why (x*5/18) mps?
Prasad kapal said:
8 years ago
But we added 500 with 140.
Rohan said:
7 years ago
Why we have to add the length of the train?
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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