Quantitative Aptitude :: Problems on Trains - Discussion

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Explanation:
Total Length = Platform Length + Train Length
So Total Length = 500m

convert the train speed (Kmph) in to mps multiply by 5/18
speed (mps) = 72 * 5/18 = 20mps
Formula Used: Time = Distance/Speed
Time = (500 / 20 ) sec
= 25 sec