Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 12)
12.
A goods train runs at the speed of 72 kmph and crosses a 250 m long platform in 26 seconds. What is the length of the goods train?
Answer: Option
Explanation:
| Speed = |  |
72 x | 5 |  m/sec |
= 20 m/sec. |
| 18 |
Time = 26 sec.
Let the length of the train be x metres.
| Then, | x + 250 | = 20 |
| 26 |
x + 250 = 520
x = 270.
Discussion:
39 comments Page 2 of 4.
Savi said:
1 decade ago
Hi @Yogesh the formula is length=speed*time
here l=x*250
speed=72*5/18=20ms
time=26s
Apply formula
x+250=20*26
=520
Now got it
here l=x*250
speed=72*5/18=20ms
time=26s
Apply formula
x+250=20*26
=520
Now got it
Suman said:
1 decade ago
Train speed m/s = 72x5/18 = 20 sec/m.
Length of train = speed x time.
= 26*20 = 520m - 250(length of the platform).
So train length = 270m.
Is it right or wrong?
Length of train = speed x time.
= 26*20 = 520m - 250(length of the platform).
So train length = 270m.
Is it right or wrong?
Piyush said:
8 years ago
The formula used is : time taken by the train = (length of train + length of platform)/ speed of the train.
Where the length of the train is taken as X.
Where the length of the train is taken as X.
Smayan said:
2 years ago
Length of train be x.
distance = x+250.
distance = speed x time.
x+250 = 72000m/3600sec x 26sec.
x+250 = 520m,
x = 520m - 250m.
x = 270m.
distance = x+250.
distance = speed x time.
x+250 = 72000m/3600sec x 26sec.
x+250 = 520m,
x = 520m - 250m.
x = 270m.
(7)
Kunal kanchan srivastava said:
1 decade ago
Station is crossed when tail of train pass, so we can't take length of train be x it should be 2x and length of the train must be 135m.
Saurabh said:
1 decade ago
Speed in meters = 72 * (5/18) = 20.
Length = speed * time.
250 + length of platform = 20*26.
Length of platform = 520-250 = 270.
Length = speed * time.
250 + length of platform = 20*26.
Length of platform = 520-250 = 270.
Avn said:
4 years ago
Shouldnt the total distance covered by the train in order to cross the platform be x + 250 + x = 2x + 250? Please anyone explain.
(1)
Sakshi said:
8 years ago
I still didn't understand why we are adding the length of the train with the distance travelled?
Please anyone explain it.
Please anyone explain it.
Abc said:
2 years ago
Distance = Speed * Time.
D = 72km/h * 26,
D = 72 * 5/18 * 26,
D = 4 * 5 * 26,
D = 20 * 26,
D = 520 - 250 = 270m.
D = 72km/h * 26,
D = 72 * 5/18 * 26,
D = 4 * 5 * 26,
D = 20 * 26,
D = 520 - 250 = 270m.
(8)
Sania said:
1 decade ago
@ NISHA
Speed is given 72 kmps. But length of platform is in meters. so we have to change it into m/s.
Speed is given 72 kmps. But length of platform is in meters. so we have to change it into m/s.
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