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:
630 comments Page 28 of 63.
Vagdevi said:
8 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:
8 years ago
Clear explanation, thanks all.
Rakesh said:
8 years ago
Nicely explanation. Thanks all.
Keerthi ramya said:
8 years ago
Well explained. Thanks all.
Akash said:
8 years ago
Thank you everyone.
Priyanka said:
8 years ago
Thank you all for explaining the answer.
Saira said:
8 years ago
Really helpful, thank you all.
Naveen said:
8 years ago
Nice explanations. Thanks all.
Vyshnavi said:
8 years ago
Why are you taking 5/18 in this problem?
Akhiruzzaman said:
8 years ago
60km per hour(60 minutes).
1km (1000 meter) per minute (60 second).
So, length= 1000/60 * 9 = 150m.
1km (1000 meter) per minute (60 second).
So, length= 1000/60 * 9 = 150m.
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