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Option 2 : 37.5 seconds
Given:
Speed of train = 72 km/hr
Formula used:
Speed = Distance/Time
Distance = Speed × Time
1 km/hr = 5/18 m/s
Calculation:
According to the question,
Speed = 72 = 72 × 5/18 = 20 m/s
∴ Length of the train = 20 × 15 = 300 meter
Length of the platform = 300 × 1.5 = 450 meter
Total distance to be crossed = Length of the platform + Length of the train
Time in which the train will cross a platform = (300 + 450)/20 = 37.5 second
∴ Time in which the train will cross a platform is 37.5 second.
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