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 2 of 62.
Dadasaheb kamble said:
12 months ago
How 5/18 came I will explain.
1 km = 1000 m.
1hr = 60min.
1 min = 60sec.
60min = 3600 sec.
1000/3600 = 5/18.
(Cancelling two zeroes up and down and 2 * 5 = 10 and 2 * 18 = 36).
1 km = 1000 m.
1hr = 60min.
1 min = 60sec.
60min = 3600 sec.
1000/3600 = 5/18.
(Cancelling two zeroes up and down and 2 * 5 = 10 and 2 * 18 = 36).
(119)
Ritik negi said:
1 year ago
1 km = 1000 m,
1 hr has 3600 sec.
So, 1 km/hr = 1000m/3600s = 5/18 m/s.
1 hr has 3600 sec.
So, 1 km/hr = 1000m/3600s = 5/18 m/s.
(106)
Shunmuk Siva Narappa R said:
2 years ago
To solve this question, you can use the formula:
Length of train = (Speed of train * Time taken to cross the pole).
Given:
Speed of train = 60 km/hr.
Time taken to cross the pole = 9 seconds.
First, convert the speed from km/hr to m/s.
60 km/hr = 60*(5/18) = 50/3 m/s.
Now, plug the values into the formula:
Length of train = (50/3 * 9).
Length of train = 150 meters.
Therefore, the length of the train is 150 meters.
Length of train = (Speed of train * Time taken to cross the pole).
Given:
Speed of train = 60 km/hr.
Time taken to cross the pole = 9 seconds.
First, convert the speed from km/hr to m/s.
60 km/hr = 60*(5/18) = 50/3 m/s.
Now, plug the values into the formula:
Length of train = (50/3 * 9).
Length of train = 150 meters.
Therefore, the length of the train is 150 meters.
(95)
Arun s said:
3 years ago
1 km = 1000 m,
1 hr has 3600 sec.
So, 1 km/hr = 1000m/3600s = 5/18 m/s.
1 hr has 3600 sec.
So, 1 km/hr = 1000m/3600s = 5/18 m/s.
(94)
Sri said:
3 years ago
How we get 5 /18? Please explain to me.
(89)
VVVR said:
1 year ago
1km = 1000m.
1hour = 3600sec.
1000/3600 = 5/18 mps.
1hour = 3600sec.
1000/3600 = 5/18 mps.
(87)
Benetict said:
1 year ago
60km/60min = 1km/min.
1km = 1000metres , 1hr = 60mins.
1000m/60min = 16.666667.
16.666667 * 9 = 150metres.
1km = 1000metres , 1hr = 60mins.
1000m/60min = 16.666667.
16.666667 * 9 = 150metres.
(79)
Aathilakshmi said:
3 years ago
Length of the train = Speed × Time.
Time=9s.
Speed = 60 km/hr. (To convert speed into m/s from km/hr)
1km = 1000m so 60km = 60000m.
1 hr = 3600seconds.
Speed = 60000/3600 m/s.
= 50/3 m/s.
Length of the train = Speed × time.
= 50/3×9.
= 150m.
Time=9s.
Speed = 60 km/hr. (To convert speed into m/s from km/hr)
1km = 1000m so 60km = 60000m.
1 hr = 3600seconds.
Speed = 60000/3600 m/s.
= 50/3 m/s.
Length of the train = Speed × time.
= 50/3×9.
= 150m.
(78)
Abhishek said:
2 years ago
60 km/h.
1 km/minutes.
1000/60 = 16.6666/sec
16.6666*9 = 150meter.
1 km/minutes.
1000/60 = 16.6666/sec
16.6666*9 = 150meter.
(77)
Sundar said:
2 decades ago
Why we are multiplying the 60 with 5/18?
The answer is simple. We are converting the 'kilo-meters/hour' value into 'meters/second'.
Let me explain about converting km/hr into m/s in detail.
1 km = 1000 meters.
1 hr = 3600 seconds.
1 km/hr = 1000/3600 m/s
= 10/36 m/s
= 5/18 m/s.
Therefore 1 km/hr = 5/18 m/sec.
Similarly 60 km/hr = 60 x 5/18 m/sec.
You may ask me, why should I convert it from km/hr to m/sec?
Because, the time taken by the train is given in terms of seconds (9 seconds) and the 4 options are in terms of metres. But the speed of the train is given in terms of km/hr. So we have to convert the values from km/hr to m/s in order to find the solution in terms of metres/seconds.
Hope you understand better. Have a nice day guys!
The answer is simple. We are converting the 'kilo-meters/hour' value into 'meters/second'.
Let me explain about converting km/hr into m/s in detail.
1 km = 1000 meters.
1 hr = 3600 seconds.
1 km/hr = 1000/3600 m/s
= 10/36 m/s
= 5/18 m/s.
Therefore 1 km/hr = 5/18 m/sec.
Similarly 60 km/hr = 60 x 5/18 m/sec.
You may ask me, why should I convert it from km/hr to m/sec?
Because, the time taken by the train is given in terms of seconds (9 seconds) and the 4 options are in terms of metres. But the speed of the train is given in terms of km/hr. So we have to convert the values from km/hr to m/s in order to find the solution in terms of metres/seconds.
Hope you understand better. Have a nice day guys!
(75)
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