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:
619 comments Page 1 of 62.
Sai dinesh nakka said:
1 week ago
Distance = speed * time.
= 60 * 5/18 * 9,
= 150m.
= 60 * 5/18 * 9,
= 150m.
(2)
Dhanu said:
3 weeks ago
The speed of the train = 60km/hr.
Pole cross time = 9 sec
So, convert speed into secs 1hr =60 minutes per minute 60 sec.
to convert 1hr in sec = 60 * 60 = 3600sec.
Now, convert km into meters 1km = 1000m.
then, speed = (60 * 1000/3600) m/s.
= (60 * 5/18) = 16.67m/s.
Now, the length of the train = speed * time.
= 16.67 * 9 = 150m.
Pole cross time = 9 sec
So, convert speed into secs 1hr =60 minutes per minute 60 sec.
to convert 1hr in sec = 60 * 60 = 3600sec.
Now, convert km into meters 1km = 1000m.
then, speed = (60 * 1000/3600) m/s.
= (60 * 5/18) = 16.67m/s.
Now, the length of the train = speed * time.
= 16.67 * 9 = 150m.
(25)
Prathna Ravindra said:
3 weeks ago
1 km = 1000 m.
1 hr = 3600 s.
So, Speed = distance/time = 1000/3600 = 5/18 m/s.
Therefore, converting 60km/hr to m/s i.e. 60 * 5/18 = 50/3 m/s.
That is Distance =Speed * time = 50/3 * 9 = 150m.
--DETAILED EXPLANATION--
1 km = 1000 m.
60 km = ?.
That is 60 * 1000/1 = 60000 m (Distance).
1 hr = 3600 s (Time).
Therefore,
Speed = Distance/Time = 60000/3600 = 50/3 m/s (Speed).
Crosses Pole in 9 seconds.
So, to find the length of the train, that is Distance = Speed * Time = 50/3 * 9 =150 m.
1 hr = 3600 s.
So, Speed = distance/time = 1000/3600 = 5/18 m/s.
Therefore, converting 60km/hr to m/s i.e. 60 * 5/18 = 50/3 m/s.
That is Distance =Speed * time = 50/3 * 9 = 150m.
--DETAILED EXPLANATION--
1 km = 1000 m.
60 km = ?.
That is 60 * 1000/1 = 60000 m (Distance).
1 hr = 3600 s (Time).
Therefore,
Speed = Distance/Time = 60000/3600 = 50/3 m/s (Speed).
Crosses Pole in 9 seconds.
So, to find the length of the train, that is Distance = Speed * Time = 50/3 * 9 =150 m.
(18)
Vanitha peddireddy said:
4 weeks ago
1km = 1000m
1h = 3600sec
Length = speed/time.
S = 1000/3600 = 5/18.
6 * 5/18 = 16.66667.
16.66667m/sec * 9 = 150m.
1h = 3600sec
Length = speed/time.
S = 1000/3600 = 5/18.
6 * 5/18 = 16.66667.
16.66667m/sec * 9 = 150m.
(13)
Poonam said:
1 month ago
It calculates as 600m->36 sec.
Then X->9sec.
By cross multiplication x =150m.
Then X->9sec.
By cross multiplication x =150m.
(6)
Mrityunjay kumar said:
1 month ago
Distance = speed * time.
i.e 150m.
i.e 150m.
(5)
SURAJ KUMAR RANA said:
2 months ago
Good explanation, Thanks all.
(3)
SURAJ KUMAR RANA said:
2 months ago
Agree, the Answer is 150m.
(2)
Sana said:
2 months ago
Good explanation. Thanks all.
(6)
Sanjana said:
2 months ago
Very good explanation. Thanks all.
(1)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers