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:
584 comments Page 1 of 59.
Astha said:
6 days ago
How come 5/18? Please explain.
(14)
Vigneshwaran said:
2 weeks ago
We are given speed as 60 km/h.
But we need the answer in meters per second (m/s).
1. First, we convert kilometres to metres:
1 km = 1000 meters.
So 60 km = 60 × 1000 = 60,000 meters.
2. Next, convert hours to seconds:
1 hour = 60 minutes
= 60 × 60 = 3600 seconds.
3. Now divide the distance by time:
60,000 ÷ 3600 = 16.666… ≈ 16.67 m/s.
then 16.6 x 9 = 150.
Then the final answer is 150 meters.
But we need the answer in meters per second (m/s).
1. First, we convert kilometres to metres:
1 km = 1000 meters.
So 60 km = 60 × 1000 = 60,000 meters.
2. Next, convert hours to seconds:
1 hour = 60 minutes
= 60 × 60 = 3600 seconds.
3. Now divide the distance by time:
60,000 ÷ 3600 = 16.666… ≈ 16.67 m/s.
then 16.6 x 9 = 150.
Then the final answer is 150 meters.
(62)
Deepak said:
2 weeks ago
@All.
Here's my explanation:
1. You have to convert speed km/h into m/s.
And the formula to convert speed km/h into m/s is 60 x 5/18 (Note : 5/18 is a constant).
Speed = 16.67 m/s.
2. Distance = speed X time.
16.67 x 9 = 150m is the length of the train.
Here's my explanation:
1. You have to convert speed km/h into m/s.
And the formula to convert speed km/h into m/s is 60 x 5/18 (Note : 5/18 is a constant).
Speed = 16.67 m/s.
2. Distance = speed X time.
16.67 x 9 = 150m is the length of the train.
(9)
Spandana pamuru said:
3 weeks ago
150 is the answer.
First of all, we convert speed into m/sec because time is in sec, so we can divide.
Speed * 5/18
Then we can calculate using the length formula i.e.., speed * time.
50/3 * 9 = 150m
So, the answer is 150m.
First of all, we convert speed into m/sec because time is in sec, so we can divide.
Speed * 5/18
Then we can calculate using the length formula i.e.., speed * time.
50/3 * 9 = 150m
So, the answer is 150m.
(8)
Kasthuri said:
1 month ago
How 5/18 came? Please explain to me.
(66)
Gunjan kumari said:
1 month ago
Option D is the right answer.
(6)
Kamalesh Kamalesh said:
1 month ago
Agree, 150 is the correct answer.
(7)
Ruchita said:
1 month ago
Firstly, you need to check what's given in the question.
So, Now.
THe Time given in seconds.
Distance needed in meters.
So, convert km/hr to m/sec.
1km = 1000m
1hr = 3600sec.
1km/hr = 1000/3600 = 5/18(m/sec).
speed = (60 *5/18) = 50 /3(m/sec).
At last,
The Length = Speed * Time = (50/3 * 9) = 150meters.
So, Now.
THe Time given in seconds.
Distance needed in meters.
So, convert km/hr to m/sec.
1km = 1000m
1hr = 3600sec.
1km/hr = 1000/3600 = 5/18(m/sec).
speed = (60 *5/18) = 50 /3(m/sec).
At last,
The Length = Speed * Time = (50/3 * 9) = 150meters.
(148)
Kopila said:
1 month ago
@All.
The answer here calculated is the distance of the train travelled in 9 seconds right, then how can you claim it as the length if the train?
The answer here calculated is the distance of the train travelled in 9 seconds right, then how can you claim it as the length if the train?
(6)
Madhusudan Jena said:
2 months ago
Given Time = 9 sec,
Covert Speed km/hr to m/sec.
1 km = 1000m,
1 hr = 60 min,
1 min = 60 sec.
60 min=(60 * 60) sec = 3600 sec.
So, 1 hr = 3600 sec.
1 hr = 3600 sec.
1 km/hr = 1km/1hr = 1000 m/3600 sec = 10/36 m/s = 5/18 m/s,
Speed = 60 km/hr = 60 * 5/18 m/s,
Speed = Distance/Time.
So, the Length of the train = Speed * Time
= 60 * 5/18*9
= 150m.
Covert Speed km/hr to m/sec.
1 km = 1000m,
1 hr = 60 min,
1 min = 60 sec.
60 min=(60 * 60) sec = 3600 sec.
So, 1 hr = 3600 sec.
1 hr = 3600 sec.
1 km/hr = 1km/1hr = 1000 m/3600 sec = 10/36 m/s = 5/18 m/s,
Speed = 60 km/hr = 60 * 5/18 m/s,
Speed = Distance/Time.
So, the Length of the train = Speed * Time
= 60 * 5/18*9
= 150m.
(68)
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