Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 21)
21.
How many seconds will a 500 metre long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?
Answer: Option
Explanation:
| Speed of the train relative to man | = (63 - 3) km/hr | |||||||
| = 60 km/hr | ||||||||
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 Time taken to pass the man |
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| = 30 sec. |
Discussion:
44 comments Page 4 of 5.
John said:
1 decade ago
How does 60 x 5 m/sec become = 50 m/sec.
18 3
18 3
Amir said:
1 decade ago
Can anyone explain me why 50/3 is inverted while calculating the time as 500 * 3/50 why not 500* 50/3 ?
Raj said:
1 decade ago
Is it same for time taken by the man to cross the train ?
Selva said:
1 decade ago
I wanna know how they calculate the speed of the train?
Samuel said:
1 decade ago
What if the man was going in the opposite direction of the train?
Shashank said:
1 decade ago
@Samuel then relative speed gets added up. Its (60+3) instead of (60-3).
Lavanya said:
1 decade ago
When two trains are travelling in the same direction and one passes the other, why is their relative speed found out by subtracting their speeds and by not adding them up?
Nisar said:
1 decade ago
Speed of train in m/s = 17.5.
Time taken to cross a man = x.
Speed of man in m/s = 0.833.
17.5*x = 500 + 0.833*x.
16.66 x = 500.
x = 30.00sec.
Time taken to cross a man = x.
Speed of man in m/s = 0.833.
17.5*x = 500 + 0.833*x.
16.66 x = 500.
x = 30.00sec.
GEETIKA SRIVASTAVA said:
1 decade ago
Why not 63+3? Please anyone explain.
Shakeena said:
1 decade ago
Both are in same direction. So we have to take 63-3=60.
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