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:
587 comments Page 32 of 59.
Rayees Khan Aryan said:
8 years ago
Length of a Train.
T = (LT+LP)/S
LT = LENGTH OF A TRAIN = ?
LP = LENGTH OF A PLATFORM = 0
S = SPEED = (60*5)/18 = 50/3
T= TIME= 9.
NOW AS PER THE QUESTION.
9 = (?+0)/ (50/3),
=> ? = (9 * 50)/3 = 150 M.
T = (LT+LP)/S
LT = LENGTH OF A TRAIN = ?
LP = LENGTH OF A PLATFORM = 0
S = SPEED = (60*5)/18 = 50/3
T= TIME= 9.
NOW AS PER THE QUESTION.
9 = (?+0)/ (50/3),
=> ? = (9 * 50)/3 = 150 M.
Harish Arora said:
8 years ago
Many time we need to change speed from km/h to mtr/sec or mtr/sec to km/h. In the question, to change a speed from km/h to mtr/sec you have to multiply with 1000 and divide with 3600 and then u get speed in mtr/sec. For eg 90km/hr in mtr/sec?
We need to do 90*1000/3600 and u ll get 25m/s. because we do this mainly on every question. so we prepare ourselves in advance by cutting these two cake to serve immediately. Again same eg. 90k/h to m/s.
90 * 5/18 = 25 m/s.
And yes if we want to change m/s to k/h just multiply with 18/5 and you'll get your speed.
Eg. 25m/s to k/h ----25 * 18/5 = 90 k/h.
We need to do 90*1000/3600 and u ll get 25m/s. because we do this mainly on every question. so we prepare ourselves in advance by cutting these two cake to serve immediately. Again same eg. 90k/h to m/s.
90 * 5/18 = 25 m/s.
And yes if we want to change m/s to k/h just multiply with 18/5 and you'll get your speed.
Eg. 25m/s to k/h ----25 * 18/5 = 90 k/h.
Rohit Sable said:
8 years ago
Thank you all, very nice explanations.
(1)
Vikas said:
8 years ago
If you divide 1000/3600 = 0.27.
But it is showing 10/36 after that 5/18.
I am not understanding how it came 10/36 then 5/18?
Please help me by explaining it.
But it is showing 10/36 after that 5/18.
I am not understanding how it came 10/36 then 5/18?
Please help me by explaining it.
AMOD KULKARNI said:
8 years ago
I easily understand the conversion. Thanks for the given explanations.
Renu patel said:
9 years ago
Really great explanation of the solution. Thank you all.
Sai lakshmi said:
9 years ago
I agree @Pradeep.
Dillip kumar said:
9 years ago
Well explained, Thanks @Sundar.
Teja said:
9 years ago
@Sundar, @Kalimuthu & @Sungathan.
Really great explanation. Thank you all for your explanations.
Really great explanation. Thank you all for your explanations.
Mohd Siddique said:
9 years ago
Thanks for explanation.
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