Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 27)
27.
A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. The length of the train is:
Answer: Option
Explanation:
| 2 kmph = |  |
2 x | 5 |  |
m/sec = | 5 | m/sec. |
| 18 | 9 |
| 4 kmph = | |
4 x | 5 | |
m/sec = | 10 | m/sec. |
| 18 | 9 |
Let the length of the train be x metres and its speed by y m/sec.
| Then, |  |
x |  |
= 9 and | |
x | |
= 10. |
|
|
9y - 5 = x and 10(9y - 10) = 9x
9y - x = 5 and 90y - 9x = 100.
On solving, we get: x = 50.
Length of the train is 50 m.
Discussion:
106 comments Page 9 of 11.
Sovaki said:
8 years ago
Can someone explain to me how you get (5/18)?
Poonam said:
1 decade ago
At last why it is multiplied by 9 not by 10?
Kubstar said:
6 years ago
@Ramya.
Why are you subtract "2" from 22?
Why are you subtract "2" from 22?
Sumit said:
5 years ago
@Ramya.
Why don't you use x-4 equation?
Why don't you use x-4 equation?
S.Banerjee said:
9 years ago
Thanks for the shortcut method @Anagha.
Nayana said:
1 decade ago
@ Ranu
Hi Ranu,
Thank you so much
Hi Ranu,
Thank you so much
Vikas3692 said:
9 years ago
@Anagha,
Please explain why 9 * 10?
Please explain why 9 * 10?
Mukundan said:
5 years ago
@Mancy.
Good Explanation. Thanks.
Good Explanation. Thanks.
Soundarya said:
10 years ago
@Kabil.
How is 55/9 is coming?
How is 55/9 is coming?
Mou444276 said:
9 years ago
@Anagha.
Why 9 *10 or not 19?
Why 9 *10 or not 19?
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