Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 26)
26.
Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 seconds. What is the length of the fast train?
Answer: Option
Explanation:
| Relative speed = (40 - 20) km/hr = |  |
20 x | 5 |  |
m/sec = | |
50 | |
m/sec. |
| 18 | 9 |
 Length of faster train = |
|
50 | x 5 | |
m = | 250 | m = 27 | 7 | m. |
| 9 | 9 | 9 |
Discussion:
72 comments Page 4 of 8.
Wangchuk said:
1 decade ago
According to formula relative speed is added when two train are moving in opposite direction and is subtracted in same direction.
Kanishk jain said:
7 years ago
Actually, it means that the length of the faster train relative to the slower train.
That's why the answer is 250/9.
That's why the answer is 250/9.
Vishnu said:
9 years ago
250/9 ==>we get.
Quotient = 27, Remainder = 7.
Then it will be in form quotient (remainder/divisor).
ie, 27 7/9.
Quotient = 27, Remainder = 7.
Then it will be in form quotient (remainder/divisor).
ie, 27 7/9.
Sunny said:
1 decade ago
Here also the faster train crossing the slower train hence we get the length of 2 trains, not the faster train.
Swati said:
8 years ago
Why do we ignore the length of the slower train, Is it because the place where the man is sitting is not fixed?
Grish said:
1 decade ago
The position of man is supposed to be ignore. It's a confusing element. Anyway the speed of slower train?
Shwetha said:
1 decade ago
Hey can anyone tell me why we have to take relative speed. When question is regarding fast train length?
Shashi said:
7 years ago
Rather than crossing man, if they asked the length of the slower train, then what will be the method?
Siddarth said:
3 years ago
250 /9 = 27.777777778 means then how to convert it into 27*7/9?
Please explain in detail.
Please explain in detail.
(1)
Bhavya said:
1 decade ago
Relative speed =40-20= 20 is okay after why we multiplied with 5/18, and wt is that 5/18?
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