A train of length 80 m crosses a platform of length 280m in 2 minutes. A person who is running in opposite direction of train crosses the train in 16 seconds. What is the speed of the person?
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2 m/sec
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2.5 m/sec
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1 m/sec
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0.5 m/sec
A
Correct answer
Explanation
Train crosses platform of length 280 m + its own length 80 m = 360 m in 2 minutes = 120 seconds. Train speed = 360/120 = 3 m/sec. Person running opposite direction crosses train in 16 seconds. Relative speed = train speed + person's speed = 80/16 = 5 m/sec. Person's speed = 5 - 3 = 2 m/sec.