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 3 of 5.
Muskan said:
6 years ago
I don't know how they calculate the speed of the train.
Sam said:
6 years ago
How come 5/18?
Tell me in details how it came?
Tell me in details how it came?
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.
Varun sen said:
1 decade ago
Why wouldn't the speed added here when man and train are approaches each other (60+6) = 66 ?
Jelli said:
1 decade ago
here the prob is to find the time=?
wkt
z=(a+b)/(u-v)
here a=500,b=0(bcz it's man,pole=0),u=60kmph,v=3kmph
then z=30sec
wkt
z=(a+b)/(u-v)
here a=500,b=0(bcz it's man,pole=0),u=60kmph,v=3kmph
then z=30sec
Megha said:
1 decade ago
Why we do this (63-3) instead of (63+3) ?
Lalitha said:
1 decade ago
We take 60-3 because man and train are going in same direction thats why we need to do subtraction.
Ravi kumar said:
1 decade ago
Train n man moving same direction n train crosses the man so we calculate speed in same direction, so are. Speed is 63-3=60.
Akshay said:
1 decade ago
How did you derive 5/18? can somebody explain?
HARMEET said:
1 decade ago
1KM=1000 METERS AND 1 HRS= 3600 SECONDS,
SO, DISTANCE/TIME= 1KM/1HOUR
1KM/1HOUR=1000 METERS/3600 SECONDS= 5/18.......
UNDERSTAND?????????
SO, DISTANCE/TIME= 1KM/1HOUR
1KM/1HOUR=1000 METERS/3600 SECONDS= 5/18.......
UNDERSTAND?????????
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