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:
597 comments Page 54 of 60.
Rakesh said:
7 years ago
Nicely explanation. Thanks all.
Anugraha B said:
7 years ago
Clear explanation, thanks all.
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.
Sadvika said:
7 years ago
Thanks all for explaining the answer.
B.srikanya said:
7 years ago
Super, clear explanation. Thanks @Sundar.
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.
Kanth said:
7 years ago
Thanks all.
Madhu said:
7 years ago
The train covers its own distance/length in 9 seconds. Therefore, its length is the distance it covers in 9 seconds. Now lets convert the speed into metres and time in seconds. The train covers 60000 metres in 3600 seconds. Therefore in 9 seconds, it would cover;
(60000/3600*9) = 150 metres.
(60000/3600*9) = 150 metres.
Anitha said:
7 years ago
Nice explanation. Thanks all.
Sk Anwar said:
6 years ago
Change the km/hr to m/sec using:
0.278*60=16.68;
16.68*9=150.12,
Answer is near the 150.
0.278*60=16.68;
16.68*9=150.12,
Answer is near the 150.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers