Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 29)
29.
A train travelling at 48 kmph completely crosses another train having half its length and travelling in opposite direction at 42 kmph, in 12 seconds. It also passes a railway platform in 45 seconds. The length of the platform is
Answer: Option
Explanation:
Let the length of the first train be x metres.
| Then, the length of the second train is |  |
x |  |
metres. |
| 2 |
| Relative speed = (48 + 42) kmph = | |
90 x | 5 | |
m/sec = 25 m/sec. |
| 18 |
 |
[x + (x/2)] | = 12 or | 3x | = 300 or x = 200. |
| 25 | 2 |
Length of first train = 200 m.
Let the length of platform be y metres.
| Speed of the first train = | |
48 x | 5 | |
m/sec = | 40 | m/sec. |
| 18 | 3 |
| (200 + y) x |
3 | = 45 |
| 40 |
600 + 3y = 1800
y = 400 m.
Discussion:
48 comments Page 5 of 5.
Sowjanya said:
1 decade ago
Can anybody explain this problem clearly ?
Rupesh said:
9 years ago
Can you explain me at relative speed?
Sai said:
7 years ago
Can anyone explain me in simple way?
Ruko said:
6 months ago
I think 600m is the correct option.
Lakhbir said:
9 years ago
How come 5/18 and what it mean?
Shivani said:
7 years ago
As per knowledge, it is 200m.
Sumit said:
10 years ago
Read the question carefully.
Royal said:
7 months ago
Can anyone explain simply?
Post your comments here:
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