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Find the time taken by 200m long train, travelling at 81 kmph to cross a man travelling at 9 kmph in the same direction ?Report Question
- a)15 sec
- b)10 sec
- c)20 sec
- d)25 sec
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Find the time taken by 200m long train, travelling at 81 kmph to cross...
Relative speed = 81-9 = 72 kmph = 72*(5/18) = 20 m/s
Time = distance/speed = 200/20 = 10 sec
So the answer is option B.
Most Upvoted Answer
Find the time taken by 200m long train, travelling at 81 kmph to cross...
Given information:
Length of the train (l) = 200 m
Speed of the train (s1) = 81 kmph
Speed of the man (s2) = 9 kmph
To find: Time taken by the train to cross the man in the same direction
Approach:
When a train crosses a man in the same direction, the effective speed of the train is the difference between the speeds of the train and the man.
Effective speed (s) = (s1 - s2) = (81 - 9) kmph = 72 kmph
We need to convert the speed to meters per second (m/s) as the length of the train is given in meters.
Speed (s) = 72 kmph = (72 * 1000) / (60 * 60) m/s = 20 m/s
Time taken (t) = Distance / Speed
Distance = Length of the train = 200 m
t = 200 / 20 = 10 seconds
Therefore, the time taken by the 200 m long train, travelling at 81 kmph to cross a man travelling at 9 kmph in the same direction is 10 seconds.
Answer: Option (B) 10 sec
Length of the train (l) = 200 m
Speed of the train (s1) = 81 kmph
Speed of the man (s2) = 9 kmph
To find: Time taken by the train to cross the man in the same direction
Approach:
When a train crosses a man in the same direction, the effective speed of the train is the difference between the speeds of the train and the man.
Effective speed (s) = (s1 - s2) = (81 - 9) kmph = 72 kmph
We need to convert the speed to meters per second (m/s) as the length of the train is given in meters.
Speed (s) = 72 kmph = (72 * 1000) / (60 * 60) m/s = 20 m/s
Time taken (t) = Distance / Speed
Distance = Length of the train = 200 m
t = 200 / 20 = 10 seconds
Therefore, the time taken by the 200 m long train, travelling at 81 kmph to cross a man travelling at 9 kmph in the same direction is 10 seconds.
Answer: Option (B) 10 sec
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Find the time taken by 200m long train, travelling at 81 kmph to cross a man travelling at 9 kmph in the same direction ?Report Questiona)15 secb)10 secc)20 secd)25 secCorrect answer is option 'B'. Can you explain this answer?
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