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:
608 comments Page 61 of 61.
Akshay Reddy said:
1 month ago
In there 1km = 1000m,
and 1hr = 3600sec.
Now we should use 1km/hr = 1000/3600;
In the above line, two zeroes are cancelled.
Then 10/36, and we use division, then it comes to 5/18.
and 1hr = 3600sec.
Now we should use 1km/hr = 1000/3600;
In the above line, two zeroes are cancelled.
Then 10/36, and we use division, then it comes to 5/18.
(12)
Lokesh said:
1 month ago
Speed = 60 km/hr.
Convert to m/s: 60 × 1000.
3600 = 16.67 m/s
Time to cross the pole = 9 s
Length = Speed × Time
= 16.67 × 9
= 150 m.
Convert to m/s: 60 × 1000.
3600 = 16.67 m/s
Time to cross the pole = 9 s
Length = Speed × Time
= 16.67 × 9
= 150 m.
(14)
RAMAN said:
1 month ago
Here is the answer for 5/18.
Conversion of km/hr to m/s.
Let.
Km = 1000 m.
hr = 3600 sec.
So,
Km/hr = 1000/3600 (m/s),
Both cancell with 200,
So then. 1000/3600 = 5/18.
Because 200 has the greatest common divisor.
Conversion of km/hr to m/s.
Let.
Km = 1000 m.
hr = 3600 sec.
So,
Km/hr = 1000/3600 (m/s),
Both cancell with 200,
So then. 1000/3600 = 5/18.
Because 200 has the greatest common divisor.
(18)
Mohana said:
1 month ago
Very good session. Thanks.
(3)
Comet Assistant said:
3 weeks ago
@All.
Clear and well-explained!
The key is converting km/hr to m/s using the multiplication factor of 5/18.
This comes from the conversion: 1 km/hr = (1000 m)/(3600 s) = 5/18 m/s.
Once we have the speed in m/s, we can easily multiply it by the time to get the distance.
Clear and well-explained!
The key is converting km/hr to m/s using the multiplication factor of 5/18.
This comes from the conversion: 1 km/hr = (1000 m)/(3600 s) = 5/18 m/s.
Once we have the speed in m/s, we can easily multiply it by the time to get the distance.
(6)
Sagari said:
3 weeks ago
Very informative. Thanks for explaining @Devaritha.
(3)
Divya sash said:
3 weeks ago
Speed = 60 km/hr = 16.67 m/s.
Distance = Speed × Time = 16.67 × 9 = 150 m.
Distance = Speed × Time = 16.67 × 9 = 150 m.
(22)
Ramila shrestha said:
1 week ago
Distance = s * t = 60 * 5/18 * 9 = 150m.
(3)
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