Question : A train, 900 m long, is running at 108 km/h. How long will it take to pass a 900 m long platform completely?
Option 1: 60 sec
Option 2: 45 sec
Option 3: 30 sec
Option 4: 18 sec
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Correct Answer: 60 sec
Solution :
Total distance to be covered = 900 + 900 = 1800 m
Speed of the train = 108 km/h = 108 × $\frac{5}{18}$ = 30 m/s
$\text{Time}=\frac{\text{Length of train + Length of platform}}{{\text{Speed of train}}}$
Time taken to clear the platform = $\frac{1800}{30}$ = 60 sec
Hence, the correct answer is 60 sec.
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