Paper 1 · Mathematical Reasoning and Aptitude
A 280 m long train is moving at a speed of 40 kmph. How much time will it take to pass a bridge that is 120 m long?
A30 seconds
B32 seconds
C36 seconds ✓ Correct
D40 seconds
Correct answer: (C) 36 seconds — It will take 36 seconds, so that is the answer.
Explanation
★It will take 36 seconds, so that is the answer.
★To pass the bridge the train must cover its own length plus the bridge length.
★That total distance is 280 plus 120, which is 400 metres.
★A speed of 40 kmph is 40 times 1000 over 3600, which is about 11.11 metres per second.
★Time is distance divided by speed, that is 400 divided by 11.11.
★This equals 36 seconds.
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