Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 1)
1.
A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
Answer: Option
Explanation:
| Speed = |  |
60 x | 5 |  m/sec |
= | |
50 | m/sec. |
| 18 | 3 |
Length of the train = (Speed x Time).
 Length of the train = |
|
50 | x 9 | m = 150 m. |
| 3 |
Discussion:
613 comments Page 26 of 62.
Rider said:
7 years ago
60 km / hour means 1km per min and also 500m in 30s and 250m in 15 sec .
So, 250m per 15sec divide 250 and 15 by 5.
So we get 3sec speed which is 50m and we multiply 3 and 50 m by 3 we get the 9sec speed which 150m.
So, 250m per 15sec divide 250 and 15 by 5.
So we get 3sec speed which is 50m and we multiply 3 and 50 m by 3 we get the 9sec speed which 150m.
B.srikanya said:
7 years ago
Super, clear explanation. Thanks @Sundar.
Sadvika said:
7 years ago
Thanks all for explaining the answer.
Vagdevi said:
7 years ago
Speed=distance/time -> Distance=speed * time.
As time in seconds, we have to change the speed to m/sec from km/hr.
For doing so we have to multiply the speed with 5/18 (km/hr=1000m/3600 sec=5/18).
Then the distance travel by train is 60*9*5/18=150m.
Because of the train crosses the pole, The distance travelled by the train equal to the length of the train.
Therefore the length of the train is 150 m.
As time in seconds, we have to change the speed to m/sec from km/hr.
For doing so we have to multiply the speed with 5/18 (km/hr=1000m/3600 sec=5/18).
Then the distance travel by train is 60*9*5/18=150m.
Because of the train crosses the pole, The distance travelled by the train equal to the length of the train.
Therefore the length of the train is 150 m.
Anugraha B said:
7 years ago
Clear explanation, thanks all.
Rakesh said:
7 years ago
Nicely explanation. Thanks all.
Keerthi ramya said:
7 years ago
Well explained. Thanks all.
Akash said:
7 years ago
Thank you everyone.
Priyanka said:
7 years ago
Thank you all for explaining the answer.
Saira said:
7 years ago
Really helpful, thank you all.
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