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A 175m long train is travelling along a straight track with a velocity 72km−1h. A bird is flying parallel to the train in the opposite direction with a velocity 18km−1h. The time taken by the bird to cross the train is
- a)35 s
- b)27 s
- c)11.6 s
- d)7 s
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A 175m long train is travelling along a straight track with a velocity...
The bird and train are moving in opposite directions, so their relative speed is the sum of their speeds: (72 km/h + 18 km/h) = 90 km/h.
Converting this speed into meters per second, we get 90 km/h = 25 m/s in SI units.
The train is 175 meters long. To find the time taken by the bird to cross the train, we use the formula: Time = Distance/Speed.
Thus, Time = 175 m / 25 m/s = 7 seconds.
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Community Answer
A 175m long train is travelling along a straight track with a velocity...
Understanding the Problem
To find the time taken by the bird to cross the train, we first need to determine the relative speeds of the train and the bird.
Step 1: Convert Speeds to m/s
- The train's speed: 72 km/h = (72 * 1000) / (60 * 60) = 20 m/s
- The bird's speed: 18 km/h = (18 * 1000) / (60 * 60) = 5 m/s
Step 2: Calculate Relative Speed
Since the bird is flying in the opposite direction to the train, we add their speeds to find the relative speed:
- Relative speed = Speed of train + Speed of bird
- Relative speed = 20 m/s + 5 m/s = 25 m/s
Step 3: Calculate Time to Cross the Train
The time taken to cross the train is determined by the length of the train and the relative speed:
- Length of the train = 175 m
- Time = Distance / Speed
- Time = 175 m / 25 m/s = 7 seconds
Conclusion
Therefore, the time taken by the bird to cross the train is 7 seconds, which corresponds to option 'D'.
This exercise demonstrates the importance of understanding relative motion in physics, especially in problems involving objects moving in opposite directions.
To find the time taken by the bird to cross the train, we first need to determine the relative speeds of the train and the bird.
Step 1: Convert Speeds to m/s
- The train's speed: 72 km/h = (72 * 1000) / (60 * 60) = 20 m/s
- The bird's speed: 18 km/h = (18 * 1000) / (60 * 60) = 5 m/s
Step 2: Calculate Relative Speed
Since the bird is flying in the opposite direction to the train, we add their speeds to find the relative speed:
- Relative speed = Speed of train + Speed of bird
- Relative speed = 20 m/s + 5 m/s = 25 m/s
Step 3: Calculate Time to Cross the Train
The time taken to cross the train is determined by the length of the train and the relative speed:
- Length of the train = 175 m
- Time = Distance / Speed
- Time = 175 m / 25 m/s = 7 seconds
Conclusion
Therefore, the time taken by the bird to cross the train is 7 seconds, which corresponds to option 'D'.
This exercise demonstrates the importance of understanding relative motion in physics, especially in problems involving objects moving in opposite directions.
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A 175m long train is travelling along a straight track with a velocity 72km−1h. A bird is flying parallel to the train in the opposite direction with a velocity 18km−1h. The time taken by the bird to cross the train isa)35 sb)27 sc)11.6 sd)7 sCorrect answer is option 'D'. Can you explain this answer? for NEET 2026 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A 175m long train is travelling along a straight track with a velocity 72km−1h. A bird is flying parallel to the train in the opposite direction with a velocity 18km−1h. The time taken by the bird to cross the train isa)35 sb)27 sc)11.6 sd)7 sCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 175m long train is travelling along a straight track with a velocity 72km−1h. A bird is flying parallel to the train in the opposite direction with a velocity 18km−1h. The time taken by the bird to cross the train isa)35 sb)27 sc)11.6 sd)7 sCorrect answer is option 'D'. Can you explain this answer?.
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