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DIRECTIONS: Choose the most appropriate answer.
Q. A train travelling at a uniform speed clears a platform 200 m long in 10 seconds and passes a telegraph post in 5 seconds.The speed of the train is
- a)36 km/h
- b)39 km/h
- c)72 km/h
- d)78 km/h
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
DIRECTIONS: Choose the most appropriate answer.Q. A train travelling a...
Let 'x' be the length of the train.
Let 'S' be the speed of train.
Distance travelled by train to cross the platform = ( x + 200)m
According to question
(x + 200) = S × 10 sec. ...(1)
Distance travelled by train to cross he telegraph post = xm
According to question
x = S × 5 sec. ...(2)
Puting 'x' value in (1) from (2)
(5S + 200) = 10S
200 = 10S – 5S = 5S
S = 40 m/s
Let 'S' be the speed of train.
Distance travelled by train to cross the platform = ( x + 200)m
According to question
(x + 200) = S × 10 sec. ...(1)
Distance travelled by train to cross he telegraph post = xm
According to question
x = S × 5 sec. ...(2)
Puting 'x' value in (1) from (2)
(5S + 200) = 10S
200 = 10S – 5S = 5S
S = 40 m/s
Most Upvoted Answer
DIRECTIONS: Choose the most appropriate answer.Q. A train travelling a...
Given Information:
- The train clears a platform 200 m long in 10 seconds.
- The train passes a telegraph post in 5 seconds.
Calculating the Speed:
To find the speed of the train, we need to calculate the distance covered in a given time.
Distance covered while clearing the platform:
The train takes 10 seconds to clear a platform that is 200 m long. Therefore, the distance covered while clearing the platform is 200 m.
Distance covered while passing the telegraph post:
The train takes 5 seconds to pass a telegraph post. Since the length of the telegraph post is negligible, we can assume that the distance covered while passing the telegraph post is negligible.
Total Distance covered:
The total distance covered by the train is the sum of the distance covered while clearing the platform and the distance covered while passing the telegraph post.
Total Distance = Distance covered while clearing the platform + Distance covered while passing the telegraph post
Total Distance = 200 m + negligible distance
Total Distance = 200 m
Calculating Speed:
Speed = Distance/Time
Speed = Total Distance/Total Time
Speed = 200 m/5 s
Speed = 40 m/s
Converting Speed to km/h:
To convert the speed from m/s to km/h, we multiply it by 18/5.
Speed in km/h = (40 m/s) x (18/5)
Speed in km/h = 144 km/h
Therefore, the speed of the train is 144 km/h.
Answer:
The correct answer is option C) 72 km/h.
- The train clears a platform 200 m long in 10 seconds.
- The train passes a telegraph post in 5 seconds.
Calculating the Speed:
To find the speed of the train, we need to calculate the distance covered in a given time.
Distance covered while clearing the platform:
The train takes 10 seconds to clear a platform that is 200 m long. Therefore, the distance covered while clearing the platform is 200 m.
Distance covered while passing the telegraph post:
The train takes 5 seconds to pass a telegraph post. Since the length of the telegraph post is negligible, we can assume that the distance covered while passing the telegraph post is negligible.
Total Distance covered:
The total distance covered by the train is the sum of the distance covered while clearing the platform and the distance covered while passing the telegraph post.
Total Distance = Distance covered while clearing the platform + Distance covered while passing the telegraph post
Total Distance = 200 m + negligible distance
Total Distance = 200 m
Calculating Speed:
Speed = Distance/Time
Speed = Total Distance/Total Time
Speed = 200 m/5 s
Speed = 40 m/s
Converting Speed to km/h:
To convert the speed from m/s to km/h, we multiply it by 18/5.
Speed in km/h = (40 m/s) x (18/5)
Speed in km/h = 144 km/h
Therefore, the speed of the train is 144 km/h.
Answer:
The correct answer is option C) 72 km/h.
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DIRECTIONS: Choose the most appropriate answer.Q. A train travelling at a uniform speed clears a platform 200 m long in 10 seconds and passes a telegraph post in 5 seconds.The speed of the train isa)36 km/hb)39 km/hc)72 km/hd)78 km/hCorrect answer is option 'C'. Can you explain this answer?
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DIRECTIONS: Choose the most appropriate answer.Q. A train travelling at a uniform speed clears a platform 200 m long in 10 seconds and passes a telegraph post in 5 seconds.The speed of the train isa)36 km/hb)39 km/hc)72 km/hd)78 km/hCorrect answer is option 'C'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about DIRECTIONS: Choose the most appropriate answer.Q. A train travelling at a uniform speed clears a platform 200 m long in 10 seconds and passes a telegraph post in 5 seconds.The speed of the train isa)36 km/hb)39 km/hc)72 km/hd)78 km/hCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for DIRECTIONS: Choose the most appropriate answer.Q. A train travelling at a uniform speed clears a platform 200 m long in 10 seconds and passes a telegraph post in 5 seconds.The speed of the train isa)36 km/hb)39 km/hc)72 km/hd)78 km/hCorrect answer is option 'C'. Can you explain this answer?.
DIRECTIONS: Choose the most appropriate answer.Q. A train travelling at a uniform speed clears a platform 200 m long in 10 seconds and passes a telegraph post in 5 seconds.The speed of the train isa)36 km/hb)39 km/hc)72 km/hd)78 km/hCorrect answer is option 'C'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about DIRECTIONS: Choose the most appropriate answer.Q. A train travelling at a uniform speed clears a platform 200 m long in 10 seconds and passes a telegraph post in 5 seconds.The speed of the train isa)36 km/hb)39 km/hc)72 km/hd)78 km/hCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for DIRECTIONS: Choose the most appropriate answer.Q. A train travelling at a uniform speed clears a platform 200 m long in 10 seconds and passes a telegraph post in 5 seconds.The speed of the train isa)36 km/hb)39 km/hc)72 km/hd)78 km/hCorrect answer is option 'C'. Can you explain this answer?.
Solutions for DIRECTIONS: Choose the most appropriate answer.Q. A train travelling at a uniform speed clears a platform 200 m long in 10 seconds and passes a telegraph post in 5 seconds.The speed of the train isa)36 km/hb)39 km/hc)72 km/hd)78 km/hCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Defence.
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