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 2 of 5.
Raj said:
1 decade ago
Is it same for time taken by the man to cross the train ?
Subhrendu said:
1 decade ago
We are dividing distance (500) by speed (50/3). So, 50/3 is in the denominator and it becomes 3/50 when we are multiplying.
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.
Vinaya said:
1 decade ago
I didn't get please explain me in detail with steps.
Neha said:
10 years ago
What is a time formula?
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