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A train 300 m long crossed a platform 900 m long in 1 minute 12 seconds. The speed of the train in km/hr was:
- a)45
- b)50
- c)54
- d)60
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
A train 300 m long crossed a platform 900 m long in 1 minute 12 second...
Distance covered in 72 sec = (300+900)m
Speed = (1200/72)m/sec
=(50/3) m/sec
= (50/3 × 18/5) km/hr = 60 km/hr
Speed = (1200/72)m/sec
=(50/3) m/sec
= (50/3 × 18/5) km/hr = 60 km/hr
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Community Answer
A train 300 m long crossed a platform 900 m long in 1 minute 12 second...
Given data:
- Length of the train = 300 m
- Length of the platform = 900 m
- Time taken to cross the platform = 1 minute 12 seconds = 72 seconds
Calculating the total distance covered:
- The total distance covered by the train to cross both the platform and its own length = 300m + 900m = 1200m
Calculating the speed of the train:
- Speed = Distance/Time
- Speed = 1200m / 72s
- Speed = 16.67 m/s
Converting the speed to km/hr:
- 1 m/s = 3.6 km/hr
- Speed = 16.67 m/s x 3.6 km/hr
- Speed ≈ 60 km/hr
Therefore, the speed of the train is approximately 60 km/hr. Hence, option 'D' (60) is the correct answer.
- Length of the train = 300 m
- Length of the platform = 900 m
- Time taken to cross the platform = 1 minute 12 seconds = 72 seconds
Calculating the total distance covered:
- The total distance covered by the train to cross both the platform and its own length = 300m + 900m = 1200m
Calculating the speed of the train:
- Speed = Distance/Time
- Speed = 1200m / 72s
- Speed = 16.67 m/s
Converting the speed to km/hr:
- 1 m/s = 3.6 km/hr
- Speed = 16.67 m/s x 3.6 km/hr
- Speed ≈ 60 km/hr
Therefore, the speed of the train is approximately 60 km/hr. Hence, option 'D' (60) is the correct answer.
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A train 300 m long crossed a platform 900 m long in 1 minute 12 seconds. The speed of the train in km/hr was:a)45b)50c)54d)60Correct answer is option 'D'. Can you explain this answer?
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